Josh being out would have to force Drew's hand at creating different lineups for game three, which would most likely include guys not getting much playing time like Tmac and Vlad Rad. Now, I could be wrong and LD could stick with the small lineup plus Collins in hopes of (coaching or forcing) the players to run and gun all night.
Since we're basically hearing that Josh is going to be out for game three; this is where Tmac should have more playing time. That means he's finally got his wish after all the belly-aching (which may be justified depending..).
Or, he could place Tmac in the 4 spot along side Ivan or Collins to help out on the boards and provide a post option on offense. At this point I would put Joe at shooting guard and Marvin or Vlad Rad(as long as he's not guarding Pierce) in at the 3. I'd actually entertain the idea of Ivan and Marvin guarding Pierce in certain situations.
Also, Dampier and Collins must be used in certain situations when Boston tries to slow it down, since their size is their biggest asset.
The time is not now for the Hawks to leave anything off the table, because game three is go time.