IMO, it is best to see Vaughn or any prospect prove himself over time. That is all I am suggesting. Vaughn has not done that yet. He hit .235 with 15 HR last season. That was not a small sample size. In addition, scouting caught up with him toward the end of the year. Vaughn is also a veritable tank, short wide and slow in the field. Sheets or Eloy are much faster than Vaughn Vaughn is probably a DH on most teams
Sheets hasn't proven much yet either, but from what I have seen in person, he has the type of powerful LH swing that could produce a lot of key HR for the Sox.
Vaughn seems like surplusage at this point for the Sox , a team that has plenty of RH power and Abreu firml;y in command at first base for a few more years.
Another consideration with a trade is the player's wishes. Vaughn is a Left coaster who misses his old friends and family and might love playing for Oakland, which is close to home for him.