You hear stories from time to time about how people who've had TJ surgery end up throwing harder after their rehab. But two questions immediately come to mind.
First, what are they comparing to? Was it their performance right before their ligament tear that required TJ surgery to correct? If so, they may, in fact, have been partially injured and already suffering a loss of velocity.
Second, what kind of shape were they in before the surgery? Obviously, if they weren't in very good shape (conditioning, strength, flexibility) then they certainly could have ended up in better shape after the TJ rehab. In this case, it's most likely the rehab work that helped them throw harder - not the surgery itself.
Dr. Andrews reports that there have been some folks who have actually contemplated having TJ surgery even though they don't need it just to get the perceived benefits. That, IMHO, is foolish. In your case, if you're just considering going through the rehab part, I would think that the benefit to be had would depend on your current shape. I would also think you could jump ahead in the rehab program since it starts off with very restricted activities and there would be no need for you to limit your activities since you are, I assume, healthy.