I'm not sure if Bully will cut as a solo act in WWE. The other three I wouldn't mind.
Jeff was a bigger star compared to RVD when he left being a huge merch seller and top face. I also think that most kids will still be familiar with him unlike RVD who is more of a throwback to the older demo, and what the kids buy makes a huge impact. I don't see Rollins having the same appeal, he is better in the ring for sure but Jeff had a look and style that just appealed to a wider audience.I don't see this. He'd get RVD reactions (good but nothing amazing) I think. Plus all of his merch base went into CM Punk, and I think Rollins already has the "it factor" that CM Punk and Jeff Hardy has with their fans if they book Rollins correctly. In short WWE really doesn't need Jeff (or Punk really) whatsoever.