I generally agree with you about years of control being an important factor here, but not sure the team is going to get a comparable talent to Jansen in a trade. In 2022 had a 2.6 WAR in less than half a season of games/PA's (4 WAR and 124 wRC+ combined in 2021-22 in 453 PA). He has power, draws walks, doesn't strike out much, doesn't hurt you on the bases, and is only 27. Assuming Ross Atkins is aware that you can in fact sign a young player to a team friendly extension at some point, it seems like Jansen is a guy who fits that criteria in a normal circumstance. His injury history might make him easier to sign too. I can't see a scenario where another team gives up a 4+ WAR CF or SP for him. Even if you were bullish on someone like Alek Thomas turning into that sort of player, would the D-Backs move him for 2 years of Jansen? Probably not.
If they decide to move Jansen, then it would be a logical way to go (less control, older, injury history, etc), so I'd have no issues with that, but from a talent + return standpoint, I'd be afraid of what Atkins gets in return. Either way, if I had to make a prediction right now, I'd say it's 80/20 in favor of the Jays keeping all 3 and trying to make it work.