I think they can and will play together. I don't buy the spacing argument AT ALL. This is predominantly a jump shooting team and we could use more penetrating, inside-bucket-producing guys who can handle the ball, create shots, and defend their position.
Basically, with Daniels' return, we can roll out a legitimate 5-man bench lineup of House/TA/Daniels/Baby/Sheed. Additionally, I think you could easily exchange Ray/Paul for House in that lineup and present some nice size mismatches for TA or Daniels, as well as some great perimeter defense. Rondo, too, could play with those four (TA/Daniels/Baby/Sheed), with some offensive adjustments.
In the end, it comes down to defense and I don't see any real reason why you can't find situations to play your best 2 perimeter defenders together at the same time. This is a defensive team first and foremost.