12,000 is wayyyy more than you would need for a sample size. Also it was across several game modes if I remember correctly. Not just 2v2.
No, it was 12000 just for 2v2. It was like 40000 games in total.
Even better, it took the matches from a fix pool of players, not just randomly.
You're a veteran player, was this data honestly surprising to you?
Again, double SU is the strongest combination due to several factors.
What i would argue is the sample pool and methodology.
I'll say 2v2 AT allies are stronger for sure, but i don't trust the numbers which are presented here.