I think there are so many more attractive options out there for the Celtics than Tyrone Lue. He's smaller than Eddie but has similar shooting abilities, though not as quick a release, better ball handling abilities and I don't think he's as good of an overall defender.
I think a run at my first choice of Roger Mason, then Beno Udrih, and Kenyon Dooling is the way I go if Eddie doesn't return before I turn Lue's way. But in the end if we do pick up Lue, I think he would fit in well.
Besides, he's a Cornhusker, he can't be all that bad.