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If Ana and her husband, David, had agreed that they needed to sell some of their properties in advance of a pending divorce settlement, then the property (or properties) that are now selling could have been put on the market some time ago, with both Ana and David in agreement to sell them. And one or more of these properties could have recently sold after being on the market for a while. David being in Serbia shouldn't have an impact on the selling of the properties, his realtor and/or attorney would normally be able to handle that in his absence. It's possible that Ana agreed to the sales before she departed for Spain. I don't see this as any evidence that David is necessarily involved in foul play here.
It could, but not necessarily.
So far there is no evidence that David is involved in Ana's disappearance, just innuendo. We need actual evidence before assuming his involvement, other than the normal practice of looking closely at the "ex" in a spouse's disapperance. So far, no evidence has surfaced. So far, it is just dueling attorneys - in Spain for Ana's family and friends, and in the U.S. for David.