The whole "would have had, wouldn't have had it" is nonsense. No one knows how Heisey would have been stationed, if by having to play in more shallow he would not have been able to get to that ball, or any thing of the sort.
As I said, it's as fruitless as watching a Stubbs AB and saying Heisey would have gotten a hit.
Stubbs has made a number of fantastic plays. As a CF, he has an excellent arm, and gets pretty good breaks on every ball.
He has two main problems, 1) Balls directly over his head, and 2) Balls near the wall. I'm pretty sure these can be fixed as he continues to grow both offensively and defensively.