No one has earned anything. Certainly not the chiefs, who lost to both teams.
Wgr was throwing around ideas to determine the #1 seed, mostly for fun. One was to use the CFB playoff format where the teams push their resumes to the middle of the table and a committee decides based on body of work. In that case, Bills have best resume of all 3 teams, if they all win this weekend. Chiefs lost to both AND have the worst loss (colts). Bengals have worse overall record.