ROR is more than just a Stastny replacement IMO. The last 3 years, ROR averaged 21:44, 21:28, and 20:49 minutes per game. The last 3 years Stastny averaged 18:18, 18:41, 17:02 minutes per game. I would be surprised if ROR suddenly went from consistently averaging 21+ minutes per game to around 18.
For the record, Schenn's average TOI the last three years was 16:45, 17:48, 19:44.
Well, for one thing, part of Schenn's fantastic year was his undeniable chemistry with Schwartz. Those two were electric, especially at even strength, and I don't mean to discount that impact.
However, I'm not just looking at even strength scoring. Looking at the raw totals, Schenn's scoring increased 27% from 55 to 70 and his ice time increased 11%. Some of that 27% increase in scoring was from Schwartz, but I think a significant part of it was also from an increase in TOI.
To put it another way, check out Schenn's P/60 stats from the last two seasons:
| p/60 | ESP/60 | aTOI |
2017-18 | 2.597 | 2.336 | 19:44 |
2016-17 | 2.345 | 1.460 | 17:48 |
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Two things stand out to me, the large (60%) increase in even strength P/60, and the fact that all situations P/60 only increased around 11%. That 11% increase (possibly from chemistry w/ Schwartz, easy usage, etc) was not the single reason that Schenn's scoring increasing 27%. Part of that increase in scoring, and I would argue a significant part, also came from the 11% increase in TOI.