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): 5 - Median hero bans (mb): 5 - Matches: 59

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

Balance rank	Winrate	Pickrate	Contest Rate
25.0	50.0	0.0	0.0

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Io	Support Offlane	3	5.08%	100.00	45.00	1	100.00%	0.2	2	54.17%	0.4
Phoenix	Support Safelane	3	5.08%	95.00	50.00	1	100.00%	0.2	2	50.00%	0.4
Dark Seer	Core Safelane	2	3.39%	90.00	15.00	1	100.00%	0.2	1	50.00%	0.2
Spirit Breaker	Core Offlane	2	3.39%	85.00	20.00	1	100.00%	0.2	1	50.00%	0.2
Bristleback	Core Safelane	2	3.39%	80.00	25.00	1	100.00%	0.2	1	36.36%	0.2
Leshrac	Core Midlane	2	3.39%	75.00	30.00	1	100.00%	0.2	1	33.33%	0.2
Rubick	Support Offlane	1	1.69%	70.00	5.00	1	100.00%	0.2	0	50.00%	0.0
Tiny	Core Midlane	1	1.69%	65.00	10.00	1	100.00%	0.2	0	100.00%	0.0
Invoker	Core Safelane	2	3.39%	60.00	35.00	1	100.00%	0.2	1	25.00%	0.2
Earthshaker	Support Offlane	2	3.39%	55.00	40.00	1	100.00%	0.2	1	23.53%	0.2
Undying	Core Safelane	5	8.47%	50.00	95.00	1	0.00%	0.2	4	58.70%	0.8
Sven	Core Midlane	2	3.39%	45.00	55.00	1	0.00%	0.2	1	100.00%	0.2
Io	Core Safelane	3	5.08%	40.00	90.00	1	0.00%	0.2	2	54.17%	0.4
Witch Doctor	Core Offlane	2	3.39%	35.00	60.00	1	0.00%	0.2	1	77.78%	0.2
Clockwerk	Support Offlane	2	3.39%	30.00	75.00	1	0.00%	0.2	1	54.55%	0.2
Gyrocopter	Core Offlane	2	3.39%	25.00	80.00	1	0.00%	0.2	1	52.63%	0.2
Visage	Core Midlane	3	5.08%	20.00	100.00	1	0.00%	0.2	2	27.27%	0.4
Viper	Core Safelane	2	3.39%	15.00	85.00	1	0.00%	0.2	1	50.00%	0.2
Axe	Core Midlane	1	1.69%	10.00	70.00	1	0.00%	0.2	0	66.67%	0.0
Dragon Knight	Support Offlane	1	1.69%	5.00	70.00	1	0.00%	0.2	0	0.00%	0.0