I think its fair to say both Marner and Strome benefit from playing on the teams their on, Marner plays with Dvorak and Domi who are both exceptional junior players and produce really well, but a lot of scouts have said Marner is the one driving the play a lot of the times on that line.
Strome got Dubrincat to play with earlier in the year and obviously the McDavid factor.
Barzal is the wildcard though, he really has no one even close to that calibre that Strome and Marner play with but hes still producing really well despite his injury. If it wasn't for his injury he might have been in top 5 discussion.