This might be sacrilege to suggest - but is Kucherov's resumé that far off from Jagr's at the same age? That being said, I agree that he hasn't necessarily separated himself from Mackinnon or Draisailtl, so the question becomes - are all three of them trending to be top-25 players of all time? Seems pretty outlandish when put into those terms.
I remember during Jagr's prime we entered every season and it was clear he was the best forward, favorite to win the Ross, and nobody else had a chance. (I may be romanticising it a bit, but that's how I remember it after Lemieux).
With Kucherov, you never enter a season thinking he's going to win the Ross....but then he does, unexpectedly.
He lead the league in scoring all of 2017-2018 till the very end when McDavid passed him.
Torched the league in 2019 when no one expected it. And no one saw it coming last year. Even this year - no one was talking about him, McDavid was expected to bounce back, and Mack/Drai were sharing the lead most of the year, yet Kucherov came out of nowhere and won his 3rd Ross.
I'm very high on Kucherov (Jagr too), so this isn't meant as a criticism, just meant to show what a stark difference there was to their Art Ross wins during their primes.
I still definitely have Jagr ahead. Where Kucherov has a chance though is that his playoffs are really very impactful (Jagr was good too, but the lack of big, long runs hurts him). Also - longevity.
Jagr has a tremendous career from a longevity standpoint - but if you really break it down, beyond age 28, he only has one season where he was among the league leaders (2006, age 33). So - if Kucherov has another ~2-3 high end seasons at this level, he can definitely still bridge the gap with Jagr.
Also - sticking to OP. I have Jagr/Ovechkin super close in all-time rankings. So everything I say in this post about distance of Kucherov to Jagr all-time, and whether he has a chance to catch him - similarly applies to Ovechkin.