Are you adding up all of these totals from Elite Prospects?
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If so, I'm not sure that's accurate. I could be wrong on this, but the USNTDP Juniors total reflects the goals that he scored for either U17 or U18 team against USHL competition. That means you're counting those goals twice.
Same goes for the WHC-17 totals and WJC-18 totals. They are broken down to show you how much he scored at those tournaments, but would already be factored into the respective totals for U17 and U18 teams -- on top two lines.
His season totals are 62 games played, 69 goals, 35 assists for 104 points.