Maybe I'm wrong, but the tampering rules prevent the two sides from talking. Sure, teams will have a game plan of who they will target, the budget for those FAs, and a contract proposal. But you can't negotiate, send proposals, feel out how much they want, etc...
It seems like many of these contracts are signed so quickly that it infers there was previous discussion already happening to get the two sides to a mutual understanding.
Maybe the Vikings reacted quickly by reaching out to Rosenhaus and he gave a demand. Or maybe Rosenhaus reached out earlier and asked a "what if" question to know what the Vikings would offer if Jones was cut.
Frankly, I find it a little weird that Jones didn't try for two years instead - unless Rosenhaus already knew people wouldn't offer it.
Either way, just saying it doesn't happen because it is "illegal" is a bit silly... Yeah, New England didn't spy on other team's signs either. 😅