I don't think "shortage of AAA filler" was among the Twins pressing needs. Except perhaps that some of their AAA filler has been on the MLB roster recently... Also, Wilk took the open 40-man spot that could have conceivably gone to a AAA call-up, like Hildenberger (doing well at AAA, will require a 40-man spot this winter anyway) or even Turley. And LHP Melotakis is approaching his 26th birthday, using his second of 3 option years, and he still hasn't sniffed AAA. Burdi hasn't touched AAA yet either and, like Hildenberger, will need a 40-man spot this upcoming winter. Same for Bard, Curtiss, Van Steensel.... there are plenty of options for "corresponding moves" without spending 40-man (and 25-man!) roster spots on AAA filler.