Question about hero win rates

[Paradox]

Heroes tend to stay between 45% and 55% win rates. Anything outside this range seems to be considered excessive.
A friend of mine is convinced that in a game with a team of 45% heroes vs a team of 55% heroes, the team with the 45% heroes would actually have less than a 45% chance of winning and the team with the 55% heroes would actually have a greater than 55% chance of winning.
Anyone ever looked into any math like this?

[AIR]

Your friend likes to pull numbers out of his assessements.

[Lemdoran]

i don't think a system exist to verify this.

but i guess it's safe to assume except if someone is REALLY good with the lowes WR heroes, it's better to avoid picking them too much as they aren't for a reason.

sometime it's not even that they are bad by themself, but just that they don't fit the current meta.

Some time it's the illusion / macro heroes, sometime the evading ones, or the tanky ones...

As an exemple, Taking a brood and relying on his spiderlings for exemple, on a meta where a LOT of ppl do either maelstrom or cleave on carry is just gonna feed enemy for no reason explaining (at least partially) his desastrous winrate.

Yet you have some exceptions, like phantom assassin.

It's an easy to counter hero, with a bad winrate, yet it's one of the most played accoding to dotabuff (15% of games in current meta) . Why? because like some other, invisibles heroes, for example, it's extremly efficient on low ranks. PPL don't know to use break, or do mkb (or reveal for invis heroes). So they seem powerfull (while thei're not)

[Abdul Healer]

When the 10 people in the game is equally skilled, its still not 100% make the team with 55% win rate heroes win the game, DoTA2 is complex game with 124 heroes, anything is possible with the game you on. But personally, the team with the more counter heroes of the enemy team will win the game (if the 10 people of the game is equally skilled)

[愚かなジャガイモ]

nope, coherency of the team comp, strategies, your understanding of the heroes and how well you can perform it is the real number here.

it does not actually matter what that statistics says, it meant almost close to nothing to you and your friend personally.

[愚かなジャガイモ]

you can play a team that consist of heroes with 90% winrate, but if you are newbie or did not master those heroes, or those heroes dont compliment each other's playstyle but rather the other way, (for e.g. timber cut his own monkey king's tree), and enemy have mastered those 20% winrate heroes and that hero comps actually compliment each other, you will still lose against them.