I'd rather stay away from the Estaalo thing but if the situation is right....have to think he'd come back focused and wanting to make good on the way he left.
Staal also has a history of performing poorly as a rental and we know firsthand what unmotivated Eric Staal looks like.
That history is too small a sample size to judge by.
And there's no reason to assume he'd be unmotivated. If anything he should be super motivated. He gets to play with his brother again. He's up for what is likely to be his last contract. He goes from a floundering team that's selling to one in the hunt. He gets to play for Brindy his mentor. He doesn't have the pressure of being "the man."
In some ways it's a ideal fit, if he can lose the whole mercurial mopey deal he gets going on for a couple months.
Don't get me wrong, I'd rather leave it in the past too. But sometimes, when the nice pizza place is all the way across town and you're broke, the $5 Little Ceasar's pizza that just happens to be a block from your house will get the job done.