Glad you asked. According to this sportsnet article, Marner seen the largest drop in slot shot% and his distance from the net shot grew the most (10'). So the stats indicate of all the core, he hid on the perimeter of the ice the most (by a large margin). The author suggests that Matthews stats might have been negatively affected by Marners perimeter play. Which I have speculated, and I only read this now:
Here is the article link:
Why Maple Leafs fell short again and what to do with Matthews, Marner
I've posted quotes below:
Another way to look at this is by “portion of shots from the slot.” This is just compared to themselves — are they getting the same quality looks they usually get per shot? The answer, outside of Matthews, is a pretty clear “no
Marner’s “portion of shots from the slot” percentage was last on the Leafs in the playoffs by over 10 per cent.
"...It’s also tough to make sense of Matthews’ dried-up point totals, but what really dropped were his primary assists, which went from 1.16 (per 60) to 0.48. Hindsight is 20/20, but seeing how far Marner was living from the net in the above stats, and that Calle Jarnkrok was on Matthews’ left side, maybe it would’ve been tough to tally many points on passes."
@Dekesfordays comments?