That’s only partly true tho — they DID get lucky that Josh wasn’t taken by one of the other QB needy teams they weren’t in a position to leap frog.
When they first swapped picks with the Bengals to position themselves for a top QB, they were comfortable with taking any of the top 3-4 qb’s on the board. Beane has confirmed that previously.
So if Josh gets plucked no1 overall or goes to the Broncos or Jets, bills are “comfortable” drafting Rosen and this regime goes up in flames within 1-3 years, depending on how much goodwill breaking the drought bought them and just how bad those seasons play out.
Unless you think they had Lamar rated over Rosen. But that’s a big, big assumption.