[Jeritron]

I don't think Ken Kennedy was wasted in WWE. Quite the contrary. They pushed the hell out of him. The problem was he would get injured right before every major push.
He won MITB: he got injured. He was supposedly in line to be Mr. McMahons illegitimate son as part of a big push: he got injured. He also got injured at least one other time after a big return and plans for a push.

So I think it was just an unfortunate string of circumstances. I don't know if either party is to blame. They tried but the guy just kept getting injured so I don't blame them for cutting him loose.

As for Matt Morgan, he's been used much better in TNA but they're still not doing him very many favors. He also wasn't nearly as good in WWE, at that point. He was way more green and uncomfortable and I don't think he was worthy of a push at the time. So it's not as simple as that.

They definitely wasted potential by cutting Dinero loose. I can't justify that. They were doing well with him during the New Breed, but they just gave up on that angle and everyone in it.
I think he could have crossed over from ECW to Raw/SD just fine, like Punk and Morrison. But despite a good start in TNA, I'm not fully convinced that they are committed to pushing him either.

Shelton is a great wrestler and exciting to watch from bell to bell, but he couldn't get it together in the other departments. In WWE that's just not going to get you a push. So no.
Same goes for Chavo, who has actually gotten a few pushes because they like him, and it just doesn't stick. He's lucky to have been around this long, tbh.

Carlito was a backstage headache and lazy as shit, reportedly. So no.

London and Kendrick got pushed as a tag team. Paul London self-destructed his career because he's an arrogant dickhead. I can't stand that guy in any interview. He seems hellbent on never getting another job in wrestling. A wrestler who can't get paid to wrestle. Good for him.

Brian Kendrick got a singles push too, and he couldn't lay off the weed. So he wasted his own potential.

How is John Morrison wasted potential? The guy has been used extremely well and things are only looking up for him. He's staggered a bit in the past year, but he seems to be on a good track and his career has already been pretty good with tremendous upside.

Calling Chris Masters a waste of potential is a joke. He was a waste of a perfectly good push.