Do you think that perhaps too much stock is put into these tournaments, a mistake we've seen repeated many times over with WJC performances?
I looked back at the leading scorers and notable names who struggled at previous Hlinka Gretzky tournaments, and well, you'll be surprised to see some of these results. Notably, Malkin put up 4 points in 4 games at the 2003 Hlinka Gretzky Cup. For a player who was as highly touted as he was, he'd also fit your description of being a disappointment in that particular tournament.
Here are a few others who had average to below average numbers.
Elite Prospects - Hlinka Gretzky Cup Stats 2014-2015
Former #2 pick Patrick Laine scored a single goal.
Former first rounder Anthony Beauvillier didn't register a single point and he's turned out okay.
Elite Prospects - Hlinka Gretzky Cup Stats 2015-2016
Pierre-Luc Dubois was 37th in scoring with only 3 assists, ended up going 3rd overall.
Elite Prospects - Hlinka Gretzky Cup Stats 2017-2018
The highly touted Jesperi Kotkaniemi who went 3rd overall only scored 4 points, 21st in scoring.
Elite Prospects - Hlinka Gretzky Cup Stats 2018-2019
Dylan Cozens put up similar numbers as Byfield did in the most recent tournament, and that didn't impact his standing as a highly touted prospect heading into his draft year.
Byfield finished 7th overall in scoring at the tournament. Look at the scoring leaders at most of the previous tournaments, they're mostly nobodies or haven't lived up to expectations. I don't think it's wise or fair to these kids to heavily weigh their play in these brief tournaments. This is how some guys get way overhyped, or even undersold. I much prefer looking at the overall picture of how a player performed regularly throughout an entire season versus a small sample size.