IMO confidence is not one of Nylander's shortcomings, but I hear what you're saying.
overall no, but sometimes he seems to be a bit out of sorts looks short of confidence. In full confidence he will drive the net, but unless he is really buzzing he will do that stop up play curl back around for the pass although this is still the safer option which maybe why he does it. That is just one play out of many in a game though so I do see your point he does overall seem like a really confident kid