For a guy that had been in the business for many years and was well-respected by his peers, it shouldn't have been hard to assemble a staff. Banker, Cavanaugh, Read, and Bray came with him from OSU, and Langsdorf was just one season removed from the Beavers. Reggie Davis played for Riley and was on his OSU staff previously. That left just Stewart, Williams, and Hughes (who was Banker's pal) that might have taken some time to find.2 months is still very little time to make up ground on recruiting kids that some staffs had been recruiting for years.
The time frame wasn't unique for a newly hired coach.