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): 2 - Matches: 6

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

Balance rank	Winrate	Pickrate	Contest Rate
2.8	5.6	0.0	0.0

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Puck	Core Midlane	5	83.33%	100.00	44.44	1	100.00%	1.0	4	75.00%	2.0
Phantom Assassin	Core Safelane	4	66.67%	94.44	27.78	2	100.00%	2.0	2	66.67%	1.0
Tiny	Support Offlane	2	33.33%	88.89	11.11	1	100.00%	1.0	1	100.00%	0.5
Viper	Support Offlane	2	33.33%	88.89	11.11	1	100.00%	1.0	1	100.00%	0.5
Magnus	Core Offlane	1	16.67%	77.78	16.67	1	100.00%	1.0	0	0.00%	0.0
Crystal Maiden	Support Safelane	1	16.67%	72.22	22.22	1	100.00%	1.0	0	0.00%	0.0
Windranger	Core Midlane	2	33.33%	66.67	33.33	1	100.00%	1.0	1	0.00%	0.5
Mars	Core Offlane	2	33.33%	61.11	38.89	1	100.00%	1.0	1	0.00%	0.5
Batrider	Core Midlane	4	66.67%	55.56	88.89	1	0.00%	1.0	3	66.67%	1.5
Marci	Support Safelane	3	50.00%	50.00	83.33	2	50.00%	2.0	1	0.00%	0.5
Winter Wyvern	Support Offlane	2	33.33%	44.44	77.78	1	0.00%	1.0	1	66.67%	0.5
Void Spirit	Core Midlane	2	33.33%	38.89	94.44	1	0.00%	1.0	1	0.00%	0.5
Bristleback	Core Offlane	2	33.33%	33.33	100.00	1	0.00%	1.0	1	0.00%	0.5
Hoodwink	Support Safelane	1	16.67%	27.78	55.56	1	0.00%	1.0	0	0.00%	0.0
Axe	Core Offlane	1	16.67%	22.22	61.11	1	0.00%	1.0	0	0.00%	0.0
Drow Ranger	Support Safelane	1	16.67%	16.67	66.67	1	0.00%	1.0	0	0.00%	0.0
Weaver	Core Safelane	1	16.67%	11.11	72.22	1	0.00%	1.0	0	0.00%	0.0
Skywrath Mage	Support Offlane	1	16.67%	5.56	55.56	1	0.00%	1.0	0	0.00%	0.0