I'd like Monroe back, but as others have said, it depends on what the Celtics want this summer. I think they'll choose between Monroe and Baynes because with Hayward coming back, there's no need to keep both. It's a shame because I think both Baynes and Moose have loved their time here.
If they want an all-around menace in the post with great rebounding, passing, and scoring abilities, they'll re-sign Moose. If they want to have the same killer defense both on the perimeter and in the post, they'll re-sign Baynes.
Something that has caught my eye is that Brad has played Monroe in crunchtime minutes rather than Baynes. Time will tell whether or not that means anything. I honestly wouldn't be surprised if Danny first goes for a big who brings the best of both worlds aka Derrick Favors or perhaps a floor-stretcher like Brook Lopez.
Remember, Danny ALWAYS goes for the gold. He's gone way out of his league in his efforts to lure free agents in the past. Remember when he tried to lure Corey Maggette after the '08 title? Or when he had David West formally agree to sign with the Celtics in 2011? Nobody thought those guys were targets. Danny always goes for the best option no matter how unrealistic it may appear on paper.