not much point in acquiring Deng. he's a good player but not going to put us near contention. I see him as a more-consistent Green. He doesn't seem to have Green's extremes in highs or lows but averages about the same.
rather get the big pieces in place first than sweat the fill ins like Deng
Mostly agree, though he's more than a "fill in" - he's a two-time All-Star and IMO a significant upgrade over Green. He is certainly a #3 guy at best though on a championship team, and I'm on board with your point about timing. He's also injured right now and/or struggling...not the kind of guy you lay out big money to extend.
The other issue to me is that he's also a bad fit with Rondo/Bradley - it'd leave us with no good three point shooters at the 1-3 positions which is a disaster in today's game. We'd then need to move Bradley.
If we could swap him for Green and re-sign him for roughly the same money (maybe with one more year), I'd say yes. But that's almost certainly not going to happen - he declined 3/30 with the Bulls.