Well, he did. He even offered to pay for getting the license back, but they denied. IH did not want to get rid of Rossi. On the contrary they absolutely wanted to keep him in tight leash silenced by NDA for as long as possible.
All this will be obvious to you when your tantrums ebb out.
As I remember it, the Rossi (and/or his supporters) CLAIMED there was a cash offer to get the IP back; but IH denied having had any such offer. I don't recall any evidence either way, but I don't remember the Rossi claiming this in any sworn deposition.