I would say at this point, yes. Simply due to the fact that the teams in the AFC east are the same as they were at the end of the season (i.e. free agents haven't left/been added, no draft yet, etc.). So just based on that I would say if all 4 teams fielded the same teams they did at the end of this season (obviously there will be changes on every team), then yes, the Bills win the AFC east.
It's too early to say as we don't know what moves will or won't occur in the next 3 months.