Unless Olynyk is able to demonstrate he belongs (possible... especially during the season), I predict the starting lineup on opening day is going to be:
Randolph
Sullinger
Green
Bradley
Rondo
If Rondo isn't ready, Lee or Brooks is going to step in at 2 and move Avery to the 2. Olynyk's prospect status, (reported) high BB IQ, and rapport with the now-current coach is going to be the key to him moving into the starting lineup.