You’re arguing two different things now. You said the Padres wouldn’t move two arms in the same deal despite just offering those two arms in a deal for a player before they had even acquired more SP depth. Now you’re arguing something about Vaughn who was never part of my hypothetical.
What we do know is the Padres offered the Mets Paddack, Pagan, & ~$30M in cash to take on Hosmer’s contract and receive Dom Smith. The Mets rejected that deal, so I think it’s safe to say the Padres would have to give more to get a deal down. And personally, I think Sheets is more valuable than Smith his lengthier amount of control remaining.