What the hell is that salesman talking about. The only thing I can remotely think of that would have any negative affect on someone would be if you ran your credit through 8 different lenders. Lenders look at inquires also but if you already bought it, it will have the same affect. You debt to income is another factor and that will be the same if you bought now or in 3 months.
I would think that would be somewhat common with the wife wanting to be in control too.