Explain this to me

This table contains stats for heroes' picks and bans.
Rank is used to sort heroes by winrate, taking number of their picks and bans into account. Higher rank means the hero is stronger. Rev-Rank (Reverse Rank) is used to show the least effective heroes with the most number of matches.
Number of bans is calculated approximately based on ratio of matches on the position to all matches of the hero.
Balance metric estimates how balanced the meta is (0 to 100)

Median hero picks (mp): 2 - Median hero bans (mb): 3 - Matches: 17

Remove low picks (0.9mp) Remove low bans (0.9mb)

Balance rank	Winrate	Pickrate	Contest Rate
27.6	36.5	19.5	16.9

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Grimstroke	Support Offlane	9	52.94%	100.00	20.27	4	100.00%	2.0	5	60.00%	1.7
Dark Seer	Core Offlane	11	64.71%	98.65	27.03	3	66.67%	1.5	8	87.50%	2.7
Io	Support Offlane	11	64.71%	97.30	37.84	2	100.00%	1.0	9	64.29%	3.0
Night Stalker	Core Offlane	9	52.94%	95.95	28.38	3	100.00%	1.5	6	50.00%	2.0
Brewmaster	Core Offlane	4	23.53%	94.59	10.81	1	100.00%	0.5	3	100.00%	1.0
Puck	Core Midlane	4	23.53%	93.24	12.16	1	100.00%	0.5	3	100.00%	1.0
Phantom Assassin	Core Safelane	10	58.82%	91.89	59.46	7	71.43%	3.5	3	33.33%	1.0
Snapfire	Support Safelane	7	41.18%	90.54	39.19	6	66.67%	3.0	1	100.00%	0.3
Queen of Pain	Core Midlane	16	94.12%	89.19	94.59	6	50.00%	3.0	10	50.00%	3.3
Dark Willow	Support Offlane	3	17.65%	87.84	2.70	1	100.00%	0.5	2	100.00%	0.7
Pangolier	Core Offlane	11	64.71%	86.49	74.32	5	60.00%	2.5	6	50.00%	2.0
Troll Warlord	Core Safelane	7	41.18%	85.14	41.89	5	80.00%	2.5	2	0.00%	0.7
Io	Support Safelane	6	35.29%	83.78	21.62	1	100.00%	0.5	5	64.29%	1.7
Lina	Core Midlane	11	64.71%	82.43	78.38	5	40.00%	2.5	6	66.67%	2.0
Tidehunter	Core Offlane	12	70.59%	81.08	86.49	6	50.00%	3.0	6	42.86%	2.0
Storm Spirit	Core Midlane	12	70.59%	79.73	87.84	5	40.00%	2.5	7	57.14%	2.3
Wraith King	Core Safelane	14	82.35%	78.38	98.65	5	40.00%	2.5	9	44.44%	3.0
Morphling	Core Safelane	8	47.06%	77.03	60.81	1	0.00%	0.5	7	71.43%	2.3
Ember Spirit	Core Midlane	5	29.41%	75.68	36.49	3	66.67%	1.5	2	50.00%	0.7
Bane	Support Offlane	8	47.06%	74.32	71.62	4	50.00%	2.0	4	50.00%	1.3
Weaver	Support Offlane	10	58.82%	72.97	85.14	5	60.00%	2.5	5	14.29%	1.7
Mars	Core Offlane	11	64.71%	71.62	95.95	6	33.33%	3.0	5	60.00%	1.7
Razor	Core Midlane	8	47.06%	70.27	70.27	2	100.00%	1.0	6	16.67%	2.0
Terrorblade	Core Safelane	6	35.29%	68.92	55.41	1	100.00%	0.5	5	40.00%	1.7
Ursa	Core Safelane	6	35.29%	68.92	55.41	1	100.00%	0.5	5	40.00%	1.7
Beastmaster	Core Offlane	11	64.71%	66.22	93.24	1	100.00%	0.5	10	30.00%	3.3
Bloodseeker	Core Safelane	7	41.18%	64.86	64.86	1	0.00%	0.5	6	66.67%	2.0
Faceless Void	Core Safelane	5	29.41%	63.51	40.54	2	50.00%	1.0	3	66.67%	1.0
Templar Assassin	Core Safelane	9	52.94%	62.16	90.54	4	50.00%	2.0	5	25.00%	1.7
Broodmother	Core Offlane	10	58.82%	60.81	97.30	1	0.00%	0.5	9	44.44%	3.0
Pangolier	Core Midlane	2	11.76%	59.46	13.51	1	100.00%	0.5	1	50.00%	0.3
Tidehunter	Support Offlane	2	11.76%	58.11	14.86	1	100.00%	0.5	1	42.86%	0.3
Lion	Support Offlane	3	17.65%	56.76	24.32	2	50.00%	1.0	1	100.00%	0.3
Mirana	Support Offlane	3	17.65%	56.76	24.32	2	50.00%	1.0	1	100.00%	0.3
Jakiro	Support Offlane	5	29.41%	54.05	66.22	4	50.00%	2.0	1	0.00%	0.3
Tusk	Support Safelane	2	11.76%	52.70	16.22	1	100.00%	0.5	1	33.33%	0.3
Bane	Support Safelane	4	23.53%	51.35	52.70	2	50.00%	1.0	2	50.00%	0.7
Skywrath Mage	Support Offlane	1	5.88%	50.00	1.35	1	100.00%	0.5	0	0.00%	0.0
Treant Protector	Support Offlane	1	5.88%	50.00	4.05	1	100.00%	0.5	0	0.00%	0.0
Dragon Knight	Core Offlane	1	5.88%	47.30	5.41	1	100.00%	0.5	0	0.00%	0.0
Kunkka	Core Midlane	1	5.88%	45.95	8.11	1	100.00%	0.5	0	0.00%	0.0
Magnus	Core Midlane	1	5.88%	45.95	8.11	1	100.00%	0.5	0	0.00%	0.0
Undying	Support Safelane	1	5.88%	43.24	9.46	1	100.00%	0.5	0	0.00%	0.0
Monkey King	Support Offlane	6	35.29%	41.89	75.68	3	33.33%	1.5	3	50.00%	1.0
Rubick	Support Offlane	5	29.41%	40.54	72.97	5	40.00%	2.5	0	0.00%	0.0
Weaver	Core Safelane	2	11.76%	39.19	17.57	1	100.00%	0.5	1	14.29%	0.3
Tusk	Support Offlane	9	52.94%	37.84	100.00	4	25.00%	2.0	5	33.33%	1.7
Templar Assassin	Core Midlane	5	29.41%	36.49	68.92	2	50.00%	1.0	3	25.00%	1.0
Oracle	Support Safelane	2	11.76%	35.14	18.92	1	100.00%	0.5	1	0.00%	0.3
Legion Commander	Core Offlane	6	35.29%	33.78	83.78	3	33.33%	1.5	3	33.33%	1.0
Snapfire	Support Offlane	5	29.41%	32.43	77.03	4	25.00%	2.0	1	100.00%	0.3
Disruptor	Support Offlane	2	11.76%	31.08	25.68	2	50.00%	1.0	0	0.00%	0.0
Void Spirit	Core Midlane	3	17.65%	29.73	62.16	3	33.33%	1.5	0	0.00%	0.0
Nyx Assassin	Support Offlane	2	11.76%	28.38	35.14	1	0.00%	0.5	1	100.00%	0.3
Batrider	Core Midlane	2	11.76%	27.03	33.78	1	0.00%	0.5	1	100.00%	0.3
Death Prophet	Core Offlane	2	11.76%	25.68	32.43	1	0.00%	0.5	1	100.00%	0.3
Chaos Knight	Core Safelane	2	11.76%	24.32	31.08	1	0.00%	0.5	1	100.00%	0.3
Death Prophet	Core Midlane	2	11.76%	22.97	29.73	1	0.00%	0.5	1	100.00%	0.3
Lycan	Core Offlane	3	17.65%	21.62	63.51	1	0.00%	0.5	2	50.00%	0.7
Monkey King	Core Safelane	4	23.53%	20.27	89.19	2	0.00%	1.0	2	50.00%	0.7
Monkey King	Support Safelane	2	11.76%	18.92	56.76	1	0.00%	0.5	1	50.00%	0.3
Pangolier	Support Offlane	2	11.76%	17.57	58.11	1	0.00%	0.5	1	50.00%	0.3
Weaver	Support Safelane	2	11.76%	16.22	67.57	1	0.00%	0.5	1	14.29%	0.3
Ancient Apparition	Support Offlane	2	11.76%	14.86	79.73	2	0.00%	1.0	0	0.00%	0.0
Kunkka	Core Safelane	2	11.76%	13.51	81.08	2	0.00%	1.0	0	0.00%	0.0
Winter Wyvern	Support Offlane	1	5.88%	12.16	48.65	1	0.00%	0.5	0	0.00%	0.0
Shadow Demon	Support Offlane	1	5.88%	12.16	48.65	1	0.00%	0.5	0	0.00%	0.0
Earth Spirit	Support Offlane	2	11.76%	9.46	82.43	2	0.00%	1.0	0	0.00%	0.0
Ancient Apparition	Support Safelane	1	5.88%	8.11	50.00	1	0.00%	0.5	0	0.00%	0.0
Naga Siren	Core Safelane	1	5.88%	6.76	44.59	1	0.00%	0.5	0	0.00%	0.0
Phoenix	Core Offlane	1	5.88%	5.41	43.24	1	0.00%	0.5	0	0.00%	0.0
Kunkka	Core Offlane	1	5.88%	5.41	45.95	1	0.00%	0.5	0	0.00%	0.0
Snapfire	Core Midlane	1	5.88%	2.70	51.35	1	0.00%	0.5	0	100.00%	0.0
Outworld Destroyer	Core Midlane	3	17.65%	1.35	93.24	1	0.00%	0.5	2	0.00%	0.7