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): 1 - Median hero bans (mb): 1 - Matches: 4

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

Balance rank	Winrate	Pickrate	Contest Rate
26.6	53.1	0.0	0.0

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Ancient Apparition	Support	4	100.00%	100.00	3.13	3	100.00%	3.0	1	100.00%	1.0
Anti-Mage	Core Safelane	2	50.00%	96.88	37.50	2	100.00%	2.0	0	0.00%	0.0
Puck	Core Offlane	3	75.00%	93.75	43.75	2	100.00%	2.0	1	0.00%	1.0
Nature's Prophet	Core Offlane	3	75.00%	90.63	46.88	1	100.00%	1.0	2	50.00%	2.0
Clockwerk	Core Offlane	2	50.00%	87.50	40.63	1	100.00%	1.0	1	50.00%	1.0
Earth Spirit	Support	1	25.00%	84.38	9.38	1	100.00%	1.0	0	0.00%	0.0
Io	Support	1	25.00%	84.38	9.38	1	100.00%	1.0	0	0.00%	0.0
Tiny	Core Safelane	1	25.00%	78.13	12.50	1	100.00%	1.0	0	0.00%	0.0
Ursa	Core Midlane	1	25.00%	75.00	25.00	1	100.00%	1.0	0	0.00%	0.0
Ember Spirit	Core Midlane	1	25.00%	75.00	25.00	1	100.00%	1.0	0	0.00%	0.0
Invoker	Core Midlane	1	25.00%	75.00	25.00	1	100.00%	1.0	0	0.00%	0.0
Death Prophet	Core Midlane	1	25.00%	75.00	25.00	1	100.00%	1.0	0	0.00%	0.0
Spirit Breaker	Support	1	25.00%	62.50	28.13	1	100.00%	1.0	0	0.00%	0.0
Pugna	Core Offlane	1	25.00%	59.38	31.25	1	100.00%	1.0	0	0.00%	0.0
Lifestealer	Core Safelane	1	25.00%	56.25	34.38	1	100.00%	1.0	0	0.00%	0.0
Jakiro	Support	4	100.00%	53.13	93.75	4	25.00%	4.0	0	0.00%	0.0
Sven	Core Safelane	2	50.00%	50.00	50.00	1	0.00%	1.0	1	100.00%	1.0
Clockwerk	Core Midlane	2	50.00%	46.88	84.38	1	0.00%	1.0	1	50.00%	1.0
Brewmaster	Core Offlane	1	25.00%	43.75	62.50	1	0.00%	1.0	0	0.00%	0.0
Enigma	Core Offlane	1	25.00%	43.75	62.50	1	0.00%	1.0	0	0.00%	0.0
Dark Seer	Core Offlane	1	25.00%	43.75	62.50	1	0.00%	1.0	0	0.00%	0.0
Keeper of the Light	Core Offlane	1	25.00%	43.75	62.50	1	0.00%	1.0	0	0.00%	0.0
Puck	Core Midlane	1	25.00%	31.25	68.75	1	0.00%	1.0	0	0.00%	0.0
Earthshaker	Support	2	50.00%	28.13	87.50	1	0.00%	1.0	1	0.00%	1.0
Dragon Knight	Core Midlane	1	25.00%	25.00	68.75	1	0.00%	1.0	0	0.00%	0.0
Earthshaker	Core Midlane	2	50.00%	21.88	90.63	1	0.00%	1.0	1	0.00%	1.0
Chaos Knight	Core Safelane	1	25.00%	18.75	78.13	1	0.00%	1.0	0	0.00%	0.0
Winter Wyvern	Core Safelane	1	25.00%	18.75	78.13	1	0.00%	1.0	0	0.00%	0.0
Doom	Core Safelane	1	25.00%	18.75	78.13	1	0.00%	1.0	0	0.00%	0.0
Templar Assassin	Core Midlane	2	50.00%	9.38	96.88	2	0.00%	2.0	0	0.00%	0.0
Razor	Core Offlane	3	75.00%	6.25	100.00	1	0.00%	1.0	2	0.00%	2.0
Bane	Support	1	25.00%	3.13	84.38	1	0.00%	1.0	0	0.00%	0.0