If the point is that personal maturity is not a pure indicator of athletic success, I fail to see how it isn't relevant. Irvin, Keyshawn Johnson, T.O., Moss, plenty of other receivers have been known for "antics" and still had long and productive NFL careers where they succeeded in the clutch. At times, they didn't. But they are all known as great receivers.
I'd like for Stevie to tone it down but mostly because of the optics of it - I think it ratchets up the pressure and is a distraction, brings unwanted attention and then makes it 1000x worse when he does fail. This discussion, case in point. But I don't think anyone can prove that there's a real correlation, because individual examples can be pointed to to display that there hasn't been any correlation. The Jordan example is just one of many where a bad teammate is actually an effective team leader because his teammates respect his play THAT much.
If, on the day Stevie leaves, other teammates open up about a perceived lack of commitment - or if that happens earlier on based on some team-wise dissent, then and only then can we really point to it.
Till then, you have to go with the fact that they keep throwing the dude the ball, and they keep trying to rely on him. It's all we've got.