Plenty of mocks to go around, but Breer is especially plugged in around the league - and he specifically says that he showed the mock to league execs and "didn't get much pushback." The Josh Allen rumors aren't going away and are either part of an elaborate smokescreen, or...
https://www.si.com/nfl/2018/03/21/mock-draft-sam-darnold-browns-bills-trade-giants-josh-allen-broncos-trade-browns-baker-mayfield
2. Buffalo (projected trade with N.Y. Giants): Josh Allen, QB, WyomingThe Bills have done a nice job building capital for a bold swing. This is one. Allen’s potential is limitless, and his big frame and arm are made for Buffalo, though he has a ways to go.