Not sure what you are trying to say here. The theory here is that it’s the other way around - your stats have impact on the team compositions.
The conspiracy theory goes like this. Suppose the matchmaker is creating two teams for a match. Suppose it selected 30 tanks/players and now it needs to decide which IS-4 goes on which team. For simplicity sake, let’s say there are 2 IS-4 selected for the match.
Of course, one could argue that this placement is completely random but the conspiracy theory says it’s not. Besides, nothing is completely random with computers, there is always an algorythm.
So we have one IS-4 with 60% win ratio and another one with 50%. We also have two teams, one with 52% average win ratio, another with 42%. The theory here is that the matchmaker will place the 60%-IS-4 with the 42%-team and the 50%-IS-4 will be placed with the 52%-team.
BTW, the matchmaker could (and probably should, if it did :)) look into your particular tank’s win ratio, not the overal one. And with tanks, we are not talking about “a bit higher, a bit lower”, it’s not uncommon to have tank’s ratios in high 60’s as well as low 30’s.
And of course, the matchmaker will also shaffle other tanks of the same weight, although higher tier tanks have the most impact.
The problem is that the higher your win ratio is, the worse teams you are going to end up with. Good players are still able to carry bad teams but only so far.
IMO this theory certainly has its right to exist. The matchmaker has to deal with gazillion of parameters but in the end, when it needs to place individual tanks into the alloted spots (eg. “T9 Heavy”), I doubt it just flips a coin.