ROR is not better than Monahan. In 9 years Ryan O'Reilly has one season where he matched Sean's career high in points. Sean has 3 seasons better than Ryan's next best season. O'Reilly has never broken 30 goals, Monahan has twice. Mony has 10 more GWG in 4 less seasons. O'Reilly averages are 4 more assists per season, but is no where near the same goal scorer. Other than face-offs, Monahan is a better player in every aspect.
What a convoluted description that makes the difference appear way higher than it is.
Monahan's top 4 years: 64, 62, 61, 58
O'Reilly's top 4 years: 64, 61, 60, 55
So a total of 5 points difference in those 4 seasons.
And while Monahan missed games last year, O'Reilly has missed games in other years where his totals would be higher.
Overall, since Monahan became a top liner in 14-15, their stat lines are as follows:
Monahan: 333 GP, 124 G, 141 A, 265 PTS
O'Reilly: 318 GP, 86 G, 161 A, 247 PTS
Per 82 games that's:
Monahan: 30.5 G, 34.7 A, 65.2 PTS
O'Reilly: 22.2 G, 41.5 A, 63.7 PTS
Monahan is the better goalscorer but they produce similarly. O'Reilly struggled to score at ES in Buffalo, but so did everyone sans Eichel, and he was fine in Colorado, so it was likely an anomaly. Monahan also has better support. Overall, Monahan is better offensively, but O'Reilly is the better play driver and better defensively, though Monahan made great strides there last year. I don't know if O'Reilly is actually better, but he's at least on the same level.
The problem is too many Flames fans want to use smaller samples for Monahan to make him look better than he is, so they get offended when he gets compared to certain players who produce similarly or he's excluded from top 20 lists. There's a lot of "well, outside of this cold start" and "before this injury". But it's been 4 years of pretty similar production. He improved his paces last year, but they were also largely in keeping with the increase in league scoring. Sure he should be hitting his peak years soon but he's also getting to the point where he probably just is what he is outside of maybe a spike year or two.