The Mets will use him as a sort of promotion. They'll use early season optimism to steel tickets first. Once that dies down, they'll bring up Darnaud at the end of May. The the All Start game hype, and finally a "come out to Citi and see Wheeler" sales pitch. Also, if the team is as bad as expected, they may not want to shake his confidence by having him up here to pitch well and still compile a 5-12 record.