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Here's what I think went through Zombie's head. He was probably all "wtf m8" when they announced a sequel. Once the original directors were dropped, he probably decided to take up their offer to take the helm so that no one else could come in and ruin it. I think he's doing the best he can do based on the fact that he never wanted a sequel and ended the first one in a way where there couldn't conceivably be one.
I'm just gonna suspend my disbelief like a good little film fan, just as I would with a pro wrestling story. It won't have to make complete sense as long as you leave entertained.