If Haye beat Valuev, how did Dirrell lose to Froch?

After watching David Haye's victory over Valuev, I wonder why some people would still question why Dirrell lost. Both fights have similarities- David Haye and Andre Dirrell used the same tactics (eg. being evasive for the majority of the fight,and throwing limited amounts of punches while Valuev and Froch chose to come forward in straight lines and throw air punches). The only difference is that this fight was even less action and did contain less fouls. I would also like to give David Haye props for getting a win in Germany and hopefully turning the heavyweight sport into a division that will get an injection of well needed excitement (ok,so this fight was dull,but could he have won employing any other tactics?)....lets hear your opinions.