You have to realize how different their value was from the start. Montour is actually older than Mantha but was still drafted a year later and in the 2nd round compared to the 1st. Now sure, Montour has done nothing but increase his value since then while Mantha's value took a hit when he started slow in the AHL. But I wouldn't say it's enough to completely erase the value discrepancy. It's not all about the point totals.
Kind of an out of context comparison. Mantha has an extra AHL season that he started by having to recover from a serious injury. His point totals were admittedly lackluster early on but he also worked a lot on rounding on his game and these days is a much more complete player, while his point totals have been steadily increasing to the point where has been PPG+ for most of this year. He's also getting his 2nd NHL call-up now while Montour is still untested in the NHL. Why, I wonder is Montour not getting the chance if he is as good defensively as Theodore and like Gostisbehere offensively?
Realistic? 30+30 top 6 winger. But he definitely has all the tools to do even more. The guy is a very underrated playmaker and has all the scoring tools in the world (reach, soft hands, wrist shot, slapshot). Classic example of a prospect that just needs to put it all together, which it now looks like he is doing or is very close to. Even playing in the top 6 next to Datsyuk last season he did not look out of place at all, the statline may not have been anything to write home about but he passed the eye test.