Im sorry I cant do this, I tried to list specific people in specific positions but the list just goes on and on -_-

Boom!

Making a game is a studio effort! 

A chain is only as strong as it's weakest link so I believe that the majority of the members were good, not bad ...

Besides it's Sakaguchi that has to prove something since he left SE while squandering every chances he had. He's not much better than SE or even better at all because he pretty much met his demise with mobile games ...

We still would've gotten the FFXIII as we know it today with or without him ...

What makes you think XIII would have been the same had Sakaguchi stayed?

Not to mention what Tetsuya Takahashi has made of himself since leaving Square. A full on Squaresoft reunion game with an unlimited budget. I couldn't even imagine. 

My dreamteam (level5 + media vision + tri-ace) would be making the ultimate JRPG

Bloodborne is going to have one example where its possible, its sony japan and fromsoftware. Two of the best studios in japan

What makes you think FFXIII wouldn't have been the same if Sakaguchi had stayed ? 

He's not some god that can turn trash into gold. What's he gonna be able to do when his former peers have turned sour and more importantly when he himself is sour ? 

The vast majority of his later career at Square was spent as producer, not as a developer so hardly did he ever help with the designs, programming, or anything anymore ...

He was executive producer though, if there was something he didn't like, he would have thrown it out. Developers just make the game, if the controls were unresponsive or it looked like crap we can blame the developers. Unfortunately everything was on point and the only crappy thing about XIII would come down to an executive decision on where the direction of the game was going. Decisions like taking out the cities and shops to streamline the story, ect. It is exactly the person in Sakaguchi's chair that screwed up XIII.

Has SE not made great games themselves too after the departure of Sakaguchi ? FFXIII is more approved by critics AND has also sold more than any of those games you mentioned but not only that they've made some great games for handhelds too so doesn't that prove anything of SE's worth ? Money sure can be a problem but you can't deny the chances he had for his studio to grow and if he truly did have skills Microsoft or Nintendo would've swooped him including his studio up by now since the title "creator of Final fantasy" isn't something minor ... 

I say yes FFXIII would've still stayed the same in part due to the fact that he hardly ever handles the development directly anymore. As for the following there's no guarantee that those games you mentioned would've done better had it been published under SE's name. The name means little when it comes to making a game succeed, what matters most is the quality of the game and the talent that the developers had ...