He was the Q.B. for a team that had won 23 straight games and was about to play for their 2nd straight title (which they spectacularly lost). The problem is that there was really no one else on Miami that you could justify giving it to - no 1,000-yard rushers or receivers, their All-Purpose threat was good but not great, and there were no defenders that had seasons like Emtman or Woodson or Suh that would have garnered enough attention to consider.
This one was made twice as bad by the fact that Marshall Faulk and Garrison Hearst were available on the ballot to select.