Looking at it objectively as a 67s fan, Pinelli would have been on my radar and would have received a selection camp invitation, but wouldn't have made my final cut.
The question is what kind of player is Team Canada getting in Pinelli?
He has elite shooting ability and is one of the OHL's best goalscorers. He does it with little help in Ottawa, and Ottawa's lack of offensive depth also means the opposition can lock-in defensively on the Pinelli line; however, Pinelli still scores plenty of goals (tied for 3rd in the OHL at the time of the camp invite).
He can create his own offense and while he's a goal scorer, he's not a goal scorer that is dependent on the playmaking ability of his centre. Foster is his centre in Ottawa, and Foster has always been a winger for the 67s.
Pinelli is a great PP asset; Ottawa's PP is 3rd in the league (last I checked). As OMG mentioned above he was in on 41% of Ottawa's goals at the time of the camp invite.
Pinelli is feisty, has a great motor, works hard at puck retrieval. I suspect if he does dress for any games in the tournament, he'll be #4LW. His skillset suggests he'd do well in an energy-type role, with some offensive upside for that line due to his elite shooting ability and ability to generate offense without star linemates. His limitations are really his lack of outstanding speed, and over-zealousness at times at puck retrieval or the silly after-the-whistle stuff.