That was an ECHL quality roster he was playing against.
He's also an 18 year old.
....and 5 of the Blues prospects this year were AHL players last year--Kostin, Reinke, Poganski, Stevens and Kaspick. Add in Alexandrov and Ellis their two highest draft picks this year.
It might be pointed out as well that without Fox, Kravtsov or Kakko--the only forward draft pick the Rangers had in the game was Henriksson--Elmer and Newell are free agent signings and the rest are either either AHL signings--Jones, Dmowski, Zerter-Gossage, McBride (don't be surprised if all these guys spend the bulk of their season in the ECHL) and invites. So the Rangers were as much--maybe even mores so an ECHL level roster than the Blues.