I would have held onto him, put the best D possible behind him every start (even if that means Brett Phillips makes the roster and plays RF every 5 games lol), and checked the offers in June/July.
Who knows, dude may even end up pitching in a game in Korea considering their next games after their first and second game are a week later. Might as well do something different and have him come out of the pen after Darvish or Musgrove.
Yeah aim higher. You figure an overpaid one year deal to Lorenzen to avoid a multi-year deal would have to not be that far off of what Montgomery would get for his first year.