Sorry, but the way you built our line-up, I have to say "yuck"! Aminu/Plumlee/Rolo? Barf! The only way I want to keep Aminu on the roster is as a bench player. If you want Rondo as the back-up, then I could see maybe doing CJ/Butler/Harkless/Plumlee/Rolo. I do like the idea of Plumlee as our PF, but not sure Rolo is the best C to pair him with. But, assuming Rondo can be 80% of the player he was in BOS, I'd rather go:
Rondo/CJ/Butler/Plumlee/Rolo
Still have the Plumlee/Rolo issue, but we have great defense with Rondo/Butler/Rolo, great offense with CJ/Butler, great passing with Rondo/Plumlee.
Regardless of how you mix/match the players I don't agree that they're a contender. At best they're a dark horse. But yeah, it's all just theoretical musings, as there's no way this would ever go down.