The biggest question mark coming into fall camp has yet to be settled. Purdue has 2 quarterbacks with starting experience. The same 2 quarterbacks also happen to be captains for the 2018 season, and both quarterbacks are coming off major surgeries to their lower extremities (Blough: Ankle - Sindelar: Knee).
Purdue played both quarterbacks last season, and I would be shocked if we didn’t see both Blough and Sindelar in most, if not every, game. That said, someone has to start, and I expect the starter to get the majority of the work, depending on how the game progresses.