If your mindset is he has a legit chance of making the team, then I agree with you. Bring him up and let him participate. I just thought we were all running on the assumpt. n that we got Poni and Joki because we were planning on him spending the year in Barrie.
Of course, if you think he has a shot and are willing to burn a year of ELC, then he should be here.
I would give him another year to get bigger and stronger, play the OHL playoffs and with St. John's.
Given the way the season has gone for St. John's the playoffs seem like quite the long shot so the chances that Scheifele sees any AHL action this season are slim even if he returns to Barrie.
With regards to the NHL, if he's ready he'll stick. Given the injury situation upfront he has a decent chance to get his 7 games in without upsetting any chemistry. Not to mention we are going to need as many players in game shape as possible to get off to a good start.