The Bills were in big-time need of a receiver after Buffalo shipped Stefon Diggs to the Texans. The team then opted for Keon Coleman in the second round of the NFL Draft. Josh Allen believes Coleman, the former Florida State star, was the absolutely perfect pick for the Bills. Granted, quarterback and receiver haven’t had much time to get on-field acquainted. Buffalo just started phase three of OTAs. In this phase, the vets along with the rookies are together on the field for the first time. You can’t tell how a rookie will react in the regular season based on a handful of seven-on-seven drill…