I'm not sure about dominant. In terms of keeping the play alive in the offensive zone he's doing all of the right things. But with Trevor Lewis sucking all of the life out of his line he hasn't gotten much going. Eichel's line is the only line that doesn't consistently get burned by cherry pickers though.Aside from the Finland game he has been dominant. I didn't watch the Belarus game but he has been impressive.
Bottom line is: it will be fun to watch him and McDavid next year in the NHL.
A lot of the games he starts out being very creative and aggressive offensively. After that his play slowly turns into keeping the coaches happy and playing "good sound Hockey". You can tell the confidence is not there for him in this tournament. Which is scary to think about.