I was a fan for years, but WWE did little to nothing with him though. Odds are if he didn't suffer that horrific injury, he still would have been wasted. Maybe he could have left and had a career resurgence. Sadly, we'll never know.
While he was a bit underrated and it's a shame his career ended the way it did (or I guess went the way it did if he had enough damage built up over time that just taking a move could cause that result) but I think you're vastly overestimating what his ceiling would have been in WWE. Assuming he wouldn't still be tagging with Cesaro (or tagging with someone, you know how WWE is about tag teams put together with former singles wrestlers) he'd probably have a midcard to upper midcard ceiling. He'd probably be in a Miz or Ziggler level spot if he was still around, sure as hell not breaking Undertaker's streak if that's what you meant. (and also wouldn't make any sense anyway since the streak was over long before he even got injured)
Hell no. I don’t miss him, he was boring. Yes his matches v the likes of Allen Jones would’ve been nice for the work rate marks, but that geek never had any business competing for a world title. And I sure hope you aren’t referring to Mark Callaway’s streak.