Reckon they'll go after Bell?
It's certainly a possibility but given how Mack had a quietly great season i feel like that would be a gross misuse of money. Mack had almost 1000 yards and 9 td's in 12 games. No reason to go get a back with miles on him like Bell.
A good chunk of that 100 million should go to bolstering the defense, perhaps getting an extra Wide Receiver if the chance presents itself.