Hagg was 19 his first year in the AHL, he played there instead of junior hockey. So he really only played "two" years in the AHL, and will turn 23 this season. Morin played two years out of juniors and will turn 22 this season. Given Friedman's age and experience, he should show he belongs in the NHL by the end of this season, he's not a 20 year old juniors graduate. And since he's filled out his frame, he's unlikely to be a "late bloomer." So I'll be disappointed if he doesn't prove to be a solid player this year and can hold his own in the AHL.
Friedman will get plenty of PK and ES time, which is where he has to excel in any case, with Ghost, Provorov and Sanheim in front of him, even if he makes the Flyers in a year or two, it would be years before he saw any PP time. So it doesn't matter if he plays PP in the AHL.