I agree, SFT.
He probably received the court order about custody on Thursday or Friday. First day off after receiving the court order would have been Saturday. Perhaps he left Saturday or Sunday, drove to Michigan, watched the house, and grabbed Venus the first opportunity he had.
Even people who don't think that Doug had anything to do with this have to admit that, considering the War of the Stewarts that had played out over the past several years, he had to be INFURIATED when he got those papers temporarily terminating his custody of the girls, and more than likely ordering child support to be paid to Venus. That was a huge win for Venus, and it likely threw him into a rage. He planned this whole thing after he received those papers. All my opinion...