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
6.1	12.1	0.0	0.0

Hero	Position	Matches	Contest Rate	Rank	Rev-Rank	Picked	Winrate	mp	Banned	Winrate	mb
Puck	Core Offlane	4	100.00%	100.00	36.36	2	100.00%	2.0	2	50.00%	2.0
Storm Spirit	Core Midlane	4	100.00%	96.97	39.39	1	100.00%	1.0	3	66.67%	3.0
Gyrocopter	Core Safelane	2	50.00%	93.94	3.03	1	100.00%	1.0	1	100.00%	1.0
Medusa	Core Midlane	4	100.00%	90.91	51.52	2	100.00%	2.0	2	0.00%	2.0
Winter Wyvern	Support	4	100.00%	87.88	63.64	1	0.00%	1.0	3	100.00%	3.0
Rubick	Support	3	75.00%	84.85	33.33	1	100.00%	1.0	2	50.00%	2.0
Night Stalker	Support	3	75.00%	81.82	48.48	2	50.00%	2.0	1	100.00%	1.0
Tusk	Core Offlane	1	25.00%	78.79	6.06	1	100.00%	1.0	0	0.00%	0.0
Enchantress	Core Jungle	1	25.00%	75.76	9.09	1	100.00%	1.0	0	0.00%	0.0
Warlock	Support	1	25.00%	72.73	18.18	1	100.00%	1.0	0	0.00%	0.0
Lich	Support	1	25.00%	72.73	18.18	1	100.00%	1.0	0	0.00%	0.0
Riki	Support	1	25.00%	72.73	18.18	1	100.00%	1.0	0	0.00%	0.0
Juggernaut	Core Safelane	1	25.00%	63.64	24.24	1	100.00%	1.0	0	0.00%	0.0
Vengeful Spirit	Core Safelane	1	25.00%	63.64	24.24	1	100.00%	1.0	0	0.00%	0.0
Phantom Lancer	Core Midlane	1	25.00%	57.58	27.27	1	100.00%	1.0	0	0.00%	0.0
Undying	Support	1	25.00%	54.55	30.30	1	100.00%	1.0	0	0.00%	0.0
Lifestealer	Core Safelane	2	50.00%	51.52	45.45	2	50.00%	2.0	0	0.00%	0.0
Sand King	Core Offlane	2	50.00%	48.48	42.42	2	50.00%	2.0	0	0.00%	0.0
Slardar	Support	3	75.00%	45.45	93.94	3	33.33%	3.0	0	0.00%	0.0
Dazzle	Support	2	50.00%	42.42	54.55	1	0.00%	1.0	1	100.00%	1.0
Mirana	Core Midlane	2	50.00%	39.39	57.58	1	0.00%	1.0	1	100.00%	1.0
Nyx Assassin	Core Offlane	2	50.00%	36.36	60.61	1	0.00%	1.0	1	100.00%	1.0
Clockwerk	Support	3	75.00%	33.33	100.00	1	0.00%	1.0	2	0.00%	2.0
Vengeful Spirit	Core Offlane	1	25.00%	30.30	87.88	1	0.00%	1.0	0	0.00%	0.0
Terrorblade	Core Safelane	1	25.00%	27.27	84.85	1	0.00%	1.0	0	0.00%	0.0
Queen of Pain	Core Offlane	1	25.00%	24.24	81.82	1	0.00%	1.0	0	0.00%	0.0
Timbersaw	Core Safelane	2	50.00%	21.21	96.97	1	0.00%	1.0	1	0.00%	1.0
Enchantress	Support	1	25.00%	18.18	78.79	1	0.00%	1.0	0	0.00%	0.0
Lifestealer	Core Midlane	1	25.00%	15.15	75.76	1	0.00%	1.0	0	0.00%	0.0
Necrophos	Core Midlane	1	25.00%	15.15	75.76	1	0.00%	1.0	0	0.00%	0.0
Queen of Pain	Core Midlane	1	25.00%	15.15	75.76	1	0.00%	1.0	0	0.00%	0.0
Phantom Lancer	Core Safelane	1	25.00%	6.06	66.67	1	0.00%	1.0	0	0.00%	0.0
Disruptor	Support	1	25.00%	3.03	93.94	1	0.00%	1.0	0	0.00%	0.0