Why is it difficult to negotiate more than one contract in the next 3 weeks? There's plenty of staff. Seriously, the team has plenty of resources to negotiate with all those where decisions need to be made before March 10th (nine free agents, Revis, Solder and Wilfork). Of course, some the lower end free agents might wait and go into free agency, without a real decisions (perhaps White, Ridley and Branch).
Mayo can wait, since there is no bonus (or immediate decision) involved. Also, it may useful for both Mayo and the team to understand the state of Mayo's health. After all, $4.5M of his salary is guaranteed if he injured.