If we didn't get the Boozer TPE then I would've believed this to be necessary to recover Boozer's scoring somehow. Yet, I agree that Harrington doesn't play defense. Although, Millsap showed me last season that he can't play big minutes yet. He wore out by the end of the season. The same could be said about Okur. Keep in mind, that Harrington can play multiple positions and he's quick enough to play team defense. Maybe he wants to win now?
Anyway, we could use our full Mid for him, use a TPE to trade for another PF, use another TPE to trade for a solid C, then just match what anyone offers Matthews.