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: 13

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

Balance rank	Winrate	Pickrate	Contest Rate
23.5	28.4	20.3	15.2

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Rubick	Support Offlane	4	30.77%	100.00	18.92	3	100.00%	1.5	1	100.00%	0.3
Bloodseeker	Core Safelane	6	46.15%	98.65	27.03	1	100.00%	0.5	5	80.00%	1.7
Invoker	Core Midlane	6	46.15%	97.30	33.78	4	75.00%	2.0	2	100.00%	0.7
Beastmaster	Core Offlane	12	92.31%	95.95	86.49	2	50.00%	1.0	10	60.00%	3.3
Ancient Apparition	Support Offlane	5	38.46%	94.59	25.68	1	100.00%	0.5	4	75.00%	1.3
Dawnbreaker	Core Offlane	5	38.46%	93.24	32.43	4	75.00%	2.0	1	100.00%	0.3
Faceless Void	Core Safelane	11	84.62%	91.89	79.73	1	100.00%	0.5	10	50.00%	3.3
Drow Ranger	Core Safelane	3	23.08%	90.54	2.70	1	100.00%	0.5	2	100.00%	0.7
Pangolier	Core Midlane	9	69.23%	89.19	62.16	2	100.00%	1.0	7	42.86%	2.3
Clockwerk	Support Safelane	3	23.08%	87.84	21.62	2	100.00%	1.0	1	66.67%	0.3
Primal Beast	Core Offlane	4	30.77%	86.49	24.32	2	100.00%	1.0	2	50.00%	0.7
Sniper	Core Safelane	7	53.85%	85.14	43.24	2	100.00%	1.0	5	40.00%	1.7
Shadow Fiend	Core Safelane	8	61.54%	83.78	70.27	5	60.00%	2.5	3	50.00%	1.0
Mirana	Support Offlane	2	15.38%	82.43	4.05	2	100.00%	1.0	0	0.00%	0.0
Clockwerk	Support Offlane	5	38.46%	81.08	37.84	3	66.67%	1.5	2	66.67%	0.7
Primal Beast	Core Midlane	6	46.15%	79.73	56.76	3	66.67%	1.5	3	50.00%	1.0
Puck	Core Midlane	7	53.85%	78.38	66.22	2	0.00%	1.0	5	100.00%	1.7
Nyx Assassin	Support Offlane	7	53.85%	77.03	68.92	4	50.00%	2.0	3	66.67%	1.0
Slardar	Core Offlane	5	38.46%	75.68	41.89	3	66.67%	1.5	2	50.00%	0.7
Undying	Core Offlane	2	15.38%	74.32	20.27	1	100.00%	0.5	1	75.00%	0.3
Snapfire	Support Offlane	6	46.15%	72.97	77.03	4	50.00%	2.0	2	50.00%	0.7
Leshrac	Core Offlane	3	23.08%	71.62	28.38	1	100.00%	0.5	2	50.00%	0.7
Leshrac	Core Midlane	6	46.15%	70.27	67.57	2	50.00%	1.0	4	50.00%	1.3
Morphling	Core Safelane	7	53.85%	68.92	85.14	2	50.00%	1.0	5	40.00%	1.7
Shadow Fiend	Core Midlane	2	15.38%	67.57	22.97	1	100.00%	0.5	1	50.00%	0.3
Mars	Core Offlane	7	53.85%	66.22	87.84	3	33.33%	1.5	4	50.00%	1.3
Pudge	Core Safelane	3	23.08%	64.86	35.14	2	50.00%	1.0	1	100.00%	0.3
Undying	Support Safelane	5	38.46%	63.51	78.38	3	33.33%	1.5	2	75.00%	0.7
Zeus	Core Midlane	4	30.77%	62.16	58.11	2	50.00%	1.0	2	50.00%	0.7
Naga Siren	Core Safelane	1	7.69%	60.81	5.41	1	100.00%	0.5	0	0.00%	0.0
Pugna	Core Midlane	1	7.69%	59.46	6.76	1	100.00%	0.5	0	0.00%	0.0
Lich	Support Offlane	1	7.69%	58.11	8.11	1	100.00%	0.5	0	0.00%	0.0
Tiny	Core Midlane	1	7.69%	56.76	9.46	1	100.00%	0.5	0	0.00%	0.0
Crystal Maiden	Support Offlane	1	7.69%	55.41	10.81	1	100.00%	0.5	0	0.00%	0.0
Broodmother	Core Offlane	1	7.69%	54.05	12.16	1	100.00%	0.5	0	0.00%	0.0
Snapfire	Support Safelane	1	7.69%	52.70	13.51	1	100.00%	0.5	0	50.00%	0.0
Lich	Support Safelane	1	7.69%	51.35	14.86	1	100.00%	0.5	0	0.00%	0.0
Riki	Core Safelane	1	7.69%	50.00	1.35	1	100.00%	0.5	0	0.00%	0.0
Dragon Knight	Core Offlane	1	7.69%	48.65	16.22	1	100.00%	0.5	0	0.00%	0.0
Pudge	Support Safelane	1	7.69%	47.30	17.57	1	100.00%	0.5	0	100.00%	0.0
Death Prophet	Core Midlane	3	23.08%	45.95	39.19	2	50.00%	1.0	1	66.67%	0.3
Marci	Support Offlane	7	53.85%	44.59	93.24	3	33.33%	1.5	4	28.57%	1.3
Disruptor	Support Offlane	2	15.38%	43.24	31.08	1	100.00%	0.5	1	0.00%	0.3
Omniknight	Support Offlane	2	15.38%	43.24	31.08	1	100.00%	0.5	1	0.00%	0.3
Marci	Support Safelane	4	30.77%	40.54	64.86	2	50.00%	1.0	2	28.57%	0.7
Void Spirit	Core Midlane	4	30.77%	39.19	63.51	1	0.00%	0.5	3	66.67%	1.0
Lina	Core Midlane	5	38.46%	37.84	83.78	1	0.00%	0.5	4	50.00%	1.3
Visage	Core Offlane	7	53.85%	36.49	94.59	1	0.00%	0.5	6	33.33%	2.0
Tusk	Support Offlane	2	15.38%	35.14	36.49	2	50.00%	1.0	0	0.00%	0.0
Omniknight	Support Safelane	3	23.08%	33.78	59.46	2	50.00%	1.0	1	0.00%	0.3
Phantom Lancer	Core Safelane	5	38.46%	32.43	91.89	2	50.00%	1.0	3	0.00%	1.0
Death Prophet	Core Offlane	5	38.46%	31.08	95.95	3	0.00%	1.5	2	66.67%	0.7
Witch Doctor	Support Safelane	2	15.38%	29.73	40.54	1	0.00%	0.5	1	100.00%	0.3
Batrider	Core Midlane	3	23.08%	28.38	71.62	1	0.00%	0.5	2	50.00%	0.7
Weaver	Core Safelane	3	23.08%	27.03	74.32	1	0.00%	0.5	2	50.00%	0.7
Batrider	Core Offlane	3	23.08%	25.68	72.97	1	0.00%	0.5	2	50.00%	0.7
Lone Druid	Core Safelane	9	69.23%	24.32	100.00	3	0.00%	1.5	6	16.67%	2.0
Undying	Core Midlane	2	15.38%	22.97	55.41	1	0.00%	0.5	1	75.00%	0.3
Primal Beast	Support Safelane	2	15.38%	21.62	60.81	1	0.00%	0.5	1	50.00%	0.3
Marci	Core Midlane	2	15.38%	20.27	75.68	1	0.00%	0.5	1	28.57%	0.3
Hoodwink	Core Offlane	1	7.69%	18.92	50.00	1	0.00%	0.5	0	0.00%	0.0
Gyrocopter	Core Safelane	1	7.69%	17.57	51.35	1	0.00%	0.5	0	0.00%	0.0
Legion Commander	Core Offlane	1	7.69%	16.22	54.05	1	0.00%	0.5	0	0.00%	0.0
Bane	Support Offlane	1	7.69%	14.86	45.95	1	0.00%	0.5	0	0.00%	0.0
Tusk	Core Offlane	1	7.69%	13.51	50.00	1	0.00%	0.5	0	0.00%	0.0
Skywrath Mage	Support Offlane	4	30.77%	12.16	98.65	4	0.00%	2.0	0	0.00%	0.0
Crystal Maiden	Support Safelane	1	7.69%	10.81	44.59	1	0.00%	0.5	0	0.00%	0.0
Io	Support Safelane	1	7.69%	10.81	47.30	1	0.00%	0.5	0	0.00%	0.0
Silencer	Support Safelane	3	23.08%	8.11	97.30	2	0.00%	1.0	1	0.00%	0.3
Tiny	Support Offlane	2	15.38%	6.76	90.54	2	0.00%	1.0	0	0.00%	0.0
Kunkka	Core Midlane	2	15.38%	5.41	81.08	1	0.00%	0.5	1	0.00%	0.3
Bristleback	Core Safelane	2	15.38%	4.05	82.43	1	0.00%	0.5	1	0.00%	0.3
Lifestealer	Core Safelane	2	15.38%	2.70	89.19	2	0.00%	1.0	0	0.00%	0.0
Lion	Support Offlane	1	7.69%	1.35	54.05	1	0.00%	0.5	0	0.00%	0.0