My grammar is all right. You can see a company as both, singular or plural, depending on whether you speak about the company as an entity or as a group of people.
My point was that EA already have a studio which makes party RPGs. It's highly unlikely that they would buy another studio for the same purpose.
They could theoretically buy them just to eliminate competition...but honestly I think that's unlikely.
RPGs aren't really EA's bread and butter, and they would probably have to pay Larian too much for a buyout given their recent success.