It wasn't an easy offseason for the San Francisco 49ers.

For the Bills, the mark handed over was a B-plus. Overall, ESPN gave only four teams a grade of A. Those were the Denver Broncos, Arizona Cardinals, San Francisco 49ers and Los Angeles Rams. The second-highest grouping was the B-plus Buffalo received.

The Miami Dolphins' offseason earned a B- grade. While not exceptional, it's certainly not the worst in the league by any stretch. It's also ahead of division rival New England, who received a C+ offseason grade from ESPN.