Drew Brees never signed his franchise tender contract last season either before getting his mega deal.
Steve Weatherford never signed his franchise tender contract last season either before getting his long term deal.
Btw, all three players mentioned got more guaranteed signing bonus money in their long term deals than the 1-year franchise tender.
Guaranteed signing bonuses are guaranteed after signature and almost impossible to change. It has to be something stupid like Michael Vick getting arrested for dog fighting and the Falcons had to go to court to get most of the signing bonus money back.