I expect a trade to bring someone who will be added to that group
Absolutely. I don't think Wilcox, Bass and KG is enough as a big man rotation when considering you'd play KG 33 minutes in the playoffs, probably Bass around 30 and you don't want Wilcox up near 30, probably closer to 20. They need 15 minutes out of either JO or somebody they manage to acquire. Obviously, Odom or Kaman would be ideal here if we are dreaming. We'd all like Johnson to step up, but he clearly doesn't have Doc's trust yet.
At the 1, you've got 38 minutes for Rondo and 10 for Bradley. Pretty straightforward, I think. At the 2 and 3, you can get away with 36 for Pierce and Ray and 20 for Pietrus, and throw Dooling out there if someone needs a break.
So right now I'm seeing 1-3 as pretty manageable with our current roster, although lacking in quality depth, but missing a big man. Either way, I'd expect to see some sort of deal to fill in the blanks unless Wilcox proves worthy of 30 minutes or Johnson steps up. That's an 8-man rotation, although I guess Dooling can take up some 1/2 minutes as well. Either way, it leaves no space for any sort of injury in the top 9.