Never said they were major studios or "big" (not sure what you mean by that Mirage or what it has to do with this thread), but those six are pretty universally well-received games that brought a lot of innovation. The list would grow if you get into debatables, there's a good deal more I would add to the list and I'm sure NeoCracker could think of more than a few as well.

But six critical darlings with big innovations is pretty nice. Has any other genre innovated more than JRPGs this generation?