I never said Stone would produce the same with more minutes on the PP, I really have no idea where you're getting that. You are suggesting that Stone playing more minutes is an advantage to him for putting up more points, but somehow don't think the allocation of those minutes matter. If you want to suggest that more minutes=more points, then we have to conclude that more PP minutes=more points. This doesn't mean Stone would produce the same as Tkachuk there, it means he would produce more than he currently is there, and at roughly the equivalent of the ES points he would lose should he also play Tkachuk's ES ice time. And yes, if Ottawa had more PP opportunities, Stone would likely play more minutes there...and score more PP points. I'm not sure what point you're trying to make with that.
As I stated before, considering the ratio of Tkachuk's PP minute advantage to Stone's ES minute advantage is roughly the equivalent of the ratio of both of their PP scoring rates to their ES scoring rates, those ice time advantages balance out. And I literally did the math for you to show that Tkachuk playing these "1st line minutes" would result in a single extra point should his scoring rates hold. I'm not "just believing these things cancel out", I proved they did statistically. Now, Tkachuk's rates likely don't stay exactly the same with different minutes, but without any statistics to show how they're likely to change, it's all we have to go on, and unless you can bring up a reason for why these don't cancel out other than meaningless terms like "1st line minutes", then ice time is not a factor here to consider. That's not to say things like PDO and the existing point gap aren't relevant.