I think you are in fact over glorifying the hockey played nowadays. Sure there is more of speed and more of fast skaters, but still the fastest skaters arent really any faster than they were in Gretzky’s or Lemieux times.
They were btw both fine skaters, but they didn’t need to really dominate with the skating because they had so amazing skills in general and especially hockey IQ. No players in todays NHL have even close to the same package of overall skills that either Gretzky or Lemieux had. Remember that both of them scored still crazy amounts of points even when they were already way over 30 years old’s with plenty of nasty injuries that took away some of their best stride. Also players after them (and whom played even at their times as youngsters, like Jagr) have been able to do mighty well in nowadays league even as way over 40 years old’s.
Hockey hasn’t really evolved as a game of skill, but has just become more even with the physical attributes. And no, Kakko as he is now isn’t even close to the class of players that Gretzky or Lemieux were as 18 old’s. Sure he is physically way more dominating than at least Gretzky and maybe even than Lemieux, but he is way behind them in skills and especially hockey IQ. It’s honestly laughable to even try to suggest that Kakko could have done better than either of them or become the same class of a player or even a better player. Absolutely laughable.