This idea that because Sacy and Pancada aren’t native English speakers that they can’t possibly win in a non Brazilian team is nonsensical.
Emea basically only consists of mixed teams. There’s no excuse given to fnatic, navi or liquid for this despite the mix being more varied than just two languages. If you look at fnatic when alfajer joined and he spoke very broken english, they made it work.
It’s actually more likely that Sen as an organisation is cursed with voodoo magic than language barriers as to why they consistently suck ass.