I question the same thing and part of me thinks that there is a chance that he might not return this season at all.
I'd try and trade him to the current Accardo owner with the line of, "Hey. Now no matter what happens in Toronto; you're assured of getting all of the saves."
Get some value for him while the Accardo owner is still thinking about the saves his new pickup may get him (and lose when and if BJ comes back).
JMO. Do with it what you feel is best.
I am a New York Jets, New York Mets, and New York Knicks fan. I know misery like few other sports fans know ...