This is just me, absolutely me, but the PJ Tucker interest screams Jimmy Butler/Paul George trade to me.
Danny might have to involve Jae Crowder in that trade, so he's looking for a guy who can play defense in that position to back up Butler/George.
Again, this is just me, if we're going full blown tin foil conspiracy theory, that is mine. That's the only way I could explain to myself our interest in PJ Tucker.