You've gotta love the people calling for HBK vs. HHH #34534. So silly.
The correct answers are Rock or Bryan.
I rather not see HBK have another match again and I don't want to see a Triple H vs HBK match. If you remember back in 2003, 2004 all their matches were the same similar to how Punk/Bryan and Orton/Cena are. I would have been happy if they just did the one Summerslam match.
People complain about newer talent not getting over, but what they mean is that their favourite isn't getting over, everyone else can go to hell. I'm for as many people getting over as possible, it would improve the show and the more over people there are, the more avenues there are to push new talent, yes, your favourites are more likely to get pushed if there are more over people to feud with.
Re: If Shawn decides to return for a Mania match, who should he work with realistical
Rock, Bryan or Punk. In that order.
Rock/HBK is probably the biggest missed matches that can still be made, Bryan/HBK would be out of this world, and Punk/HBK would be a fresh main-event feud that could produce something special (their segment together last year was great).