It would likely be McGroarty and a minor plus, probably one of their 3rds.
Would suck to give up McGroarty but Jiricek simply has a higher upside. No brainer to do McGroarty and a 3rd for Jiricek IMO. Especially with how good WBS's forward group is right now, I think you can afford to
Their long-term top-4 would be sitting well with Jiricek, Pickering and Brunicke as 3 of the 4 and they're obviously well set in net with Murashov and Blomqvist. They can really focus heavily on forwards at that point, both with draft picks and acquired prospects in trades.