Guerin is not going to trade Rossi for a player that needs developing while MN is near the top of the standings, and Kaprizov is unsigned. Not going to happen. He's got Yurov, ands maybe Heidt, as C development projects. he is not going to punt on this season, unless soemthing goes terribly wrong in the new year(i.e. Kaprizov and/or Gus injured).
Jiricek was Guerin's development gamble.
I don't mean to imply that Rossi is some amazing player that is beyond price. What i do mean to say is that there are a string of circumstances(little to no cap space, JEE injury, Kaprizov unsigned, excellent record, lack of other C alternatives) specific to MN that have aligned to make Rossi almost untouchable.