Rodgers nor Brady have any reason to want to play in Tennessee and both would be a 1 year rental as both are mulling retirement anyway. Tannehill is the best option. Restructure his deal, make some cap room for some pieces around him and Tannehill is a capable QB. Sure, the Titans need to be looking towards the future at QB but what you're suggesting is just renting a 45 year old QB on a team with no OL or WRs to speak of. Again, no reason in the world Brady would want to play in TN in the first place.