Again, it's probably a very complex offer well beyond what most FA deal with, if only because so much of his value on the field is tied up in being a two way player. I'm sure different teams are offering varying conditions, bonuses, etc. Which then requires multiple iterations talking with multiple teams to try to get favored terms agreed to, while not bending on what he likes from those offers. Then teams take time to evaluate and reply.
These things just take time.