So I realized winrate is very misleading

I have one Plat account where I have JG primary and Mid secondary with a 60% Ziggs winrate over a decent sample. Another account with Mid primary and JG secondary has me also in Plat (because I had JG primary when doing promos and stuff) but only 45% winrate on Ziggs over a similar sample. My conclusion is that picking Mid primary means I have to carry way harder to achieve similar performance for Mid than if I am Mid secondary. If I'm secondary, I can just feed less and get carried for the most part.