Assuming Rondo, Sullinger, Bradley (playing, but hurting) are injured.
Bass
Humphries
Olynyk
Green
Lee
This group provides a combination of rebounding, speed, offense and defense.
Olynyk may not start, but he'll play starter minutes. My feeling (as of now) is that he'll elevate the performance of others on the court with his keen passes and offensive savvy.
I know there isn't a lot of love for Bass, but he's more solid (not better)than Wallace.
This is an interesting OP because it makes us realize how valuable Humphries now becomes with the departure of KG and Pierce. I'm doubting more and more that he'll be traded.