If anything it could make it more difficult since most people who get a 73 type are doing it to try to get on with SWA. It makes it tough to be convincing that DAL is where you really want to be in an interview when you have a type rating without a purpose except for getting hired at SWA. What I mean is it's one thing to have a type because you were using it for something, another to have one that implies you got it to get on somewhere different.