I agree with the Admin (don't know your actual name, sorry! lol) that we really have no reason to believe a scenario like this could happen. The two aren't mutually exclusive, ya' know? Andy and Neal can do MWK and/or THH shows and still join David for the next record. That's exactly what they're doing right now.
But if by some chance they *couldn't* have done both, I'd have rather seen MWK live. MWK gives Neal a chance to showcase his songwriting skills, and Andy a chance to showcase his vocal skills. Right now they can't really do that very much with David. I'd be bummed if Neal and Andy weren't on DCTR2, but it's more important to me that they be *on tour* with him than that they be in the studio with him. Just my opinion. YMMV.