i have never seen Drummond play except for some of the clips on youtube. while i think he will be a starter from day 1, a lot depends on how he grasps the college game. if he's a bit confused or tentative, JC might start Giffey at the 3 and push Roscoe to the 4 and Oriakhi to the 5 in order to have Drummond watch, get into the flow, then get on the court.
having said that i still think Shabazz, Jeremy, Roscoe, Alex, and Andre are our starters on day 1 with lots of PT for Boatright, Giffey, and Daniels. i'm unsure how much PT Olander, Bradley or Wolf will get this year, but if one of Drummond/Oriakhi is always on the court as the 5 then i can see Olander getting some good PT backing up the 4 spot. Olander started a good number of games last year even if he only lasted 5 minutes. clearly JC trusted him as a freshman to NOT make stupid mistakes and be solid...