I think a lot of the potential winners peaked far too early and when you're at the top the only way is down unfortunately (for them!).
With Dexter he's had to fight inside the house against constant personal attacks and against people who were just too dull to understand him and he's had to fight every week to keep himself in the house and to make enough of the public appreciate him for what he is and to keep him in there.
He's always been very open about the fact that he's far from perfect and i think that's why more and more of the public have grown to love and admire him for at least being interesting and entertaining episode after episode!
I really think everything's aligning at the perfect time for him to push through and possibly win this thing and if he does i don't think anyone in there has done more to deserve it than he has!
Go Dexter FTW !!!!!!