I'm expecting Mookie to be a Padre, as San Diego 1) has 40 man roster issues and 2) has already issued a statement that they will be packaging prospects in order to upgrade the MLB roster.
Per Matt Cerrone, the Red Sox asking price for Betts is two good prospects, an outfielder to replace Betts, and a mid-rotation SP.
If the Sox deal with the Padres, they might be able to get RHSP Cal Quantrill (mid-rotation SP), OF Franchy Cordero (the outfielder to replace Betts), 2B Xavier Edwards and LHP David Weathers (the two good prospects).
San Diego would get an MVP-caliber outfielder and free up some 40-man roster space to protect other prospects from the Rule 5 draft. The Red Sox get their potentially unrealistic trade demands. And Betts gets to live for a year in San Diego, which is something everyone should want.
Win-win-win...