ZAR was a young player that only Sullivan gave a chance in the league and everyone else is "pulling a Sully?" then, right...?
Anyhow, being comfortable on RW as a LHS and being an NHL RW as a LHS have a chasm between them. If anyone saw my (or any?) video on him, you can see some limitations in the puck skills and deception in traffic and in space. So, playing with the puck constantly exposed into the interior puts a lot of skills on notice. But it also matters in terms of utilization.
As a third wheel, coming late, to just purely shoot (and possibly retrieve)...fine. He can probably handle that. Most players with a shot can. I think it's a little limiting to do that right off the bat October 11th or whatever. I think that's not the best for his development, personally.
There's also other aspects to consider. Rick Nash in his later days - and he doesn't get enough credit for it - moved to the other wing at points because he was paired with Chris Kreider...very much a straight-ahead, downhill player. Jerome Bettis in a way. Early Steelers/Late Rams Bettis...not "can you believe the Super Bowl is in Detroit and he's from Detroit!?!?!" Bettis. So, Nash actually morphed into a NZ playmaker. He drew players to him in the NZ, and then bought time and space to dish to Kreider to create speed differential plays/dekes. It was quite an adaptation.
Ideally, you want both and more from a top prospect. But it really depends on what the roster has and needs and more importantly where McGroarty is. He didn't look like an NHL player to me at last check, but summers can change guys at this age.