If you think he would go out of his way or take less money to tick off a guy he's making money on you don't understand how this works, and Spanos doesn't give a freak about anything but money. Neither of these guys do.
Yeah, admittedly I am not an owner so it's accurate to say I don't understand it. Just spitballin here of course.
But that aside, I do recall that the rent is ridiculously cheap as per their agreement post-decision. And it seems to me that Stan, given the nature of the fallouts of many business deals in his past, isn't beyond holding the landlord status over Dean in many small ways (since the NFL basically dictated that he play nice with Dean as a tenant).
Surely for Dodge to win that naming deal they'd have to field a competitive offer, I mean obviously Stan wouldn't take peanuts for it, but it is a nice fit and assuming the dropoff in the offer isn't too great I think it would be not only one of the best sponsorship deals in the league in terms of appropriateness wrt to the team name, but it would also infuriate the tenant who would need to hear that reference every single time the stadium they play in is mentioned.
Call me crazy, but I don't think Stan's above basic antagonizing of the rival who tried to keep him out of LA.