I said ...", deliver it when most needed.."...3/4 of your post agrees with my assessment.
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"The goal he scored was impressive and came at a critical time in the game - no doubt. That's a sign of a great player - a goal when his team needs it most. But the goal was a single shorthanded rush. Great shot, but I don't think he carried the game."
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Case closed...

All the other "young guns" in the league right now, are just that - high goal scoring (see their imbalance between goals and assists) excellent snipers...Most definitely a core part of any team that wants to do well..You need them.

But leaders, or players who can make anyone on their line a star? ..no. Or certainly not to the extent that someone like McDavid does. One of the US webcasts did some analysis month ago, and no other player affects his teams' performance on/off the ice as much as him, and by some insane margin...if I recall, with him on the ice, Oilers are a top 3 team. Without? Something like 21st.