Of the guys we're hoping are available, I think Cousins is the worst fit. Certainly not the perfect fit being cited here.
I don't see how he and Horford fit together. In this NBA, they're both centers. I know Horford sees himself as a PF, but he isn't.
I can't imagine it going well having either one of them chasing stretch 4s around all game, and even worse when the opponent goes with a small ball 4 lineup.
Also, would block the Celtics ever playing small themselves, since two of Horford, Boogie and Olynyk would pretty much always be on the floor.
Don't see it affecting IT defensive issues either. His biggest issue isn't guys blowing by him into the paint, it's guys shooting over him.
Fit-wise for the Celtics of the guys we're wishcasting for, I think it's Butler>George>Boogie.