In any case, that discussion gives us a fairly clear picture of what the Padres' package for Betts might look like: a prospect or two (say, catcher Luis Campusano and/or lefty Adrian Morejon), a controllable big league piece or two (say, Josh Naylor and/or Joey Lucchesi) and Myers plus cash.
Campusano, Morejon, Margot, Lucchesi and Myers isn't that bad of a return. I don't know what else people expect out of a one year rental.
Without Myers included, the Sox would probably only get Margot and Campusano. A big part of the deal seems to be clearing Myers off the books. If the Sox solely want to get under the lux tax, just take back a smaller return.