I think you're right about the Browns, that leaves the 49ers, Bears and Jets as teams that could possibly take a QB before the Bills pick. If all three take QBs, Watson is gone. If the Bills really want him they have to make a deal with the 49ers.
When Andy Robustelli was GM of the Giants, he once said that from a business standpoint the best place to finish was to almost make the playoffs every year. That way the fans are excited for next year and you didn't draft to high, so you didn't have to pay a lot.