I don't see the point in comparing Draisaitl to Kuznetzov. It is better to compare like with like. When people bring up the extra UFA years on the Kuz deal, I have to say that yes, UFA years should cost more, but that invites one to look at what happened in all those previous years. Kuznetzov had a slower ascent than Draisaitl, was less proven at the time of signing despite being older, and of course was drafted much lower. UFA years are worth a lot because of leverage, sure, but those big UFA numbers only go to players who were consistent in those RFA years. That's why Johansen only costed 8 million AAV despite having all those UFA years.
I don't think that Kuznetzov was used as the main comparable for the Draisaitl contract. I strongly believe that during that offseason, the agents of Drai and McDavid used a cap percentage argument. McDavid's comparable was Crosby, and sure enough the cap percentage was a bit less than Crosby's 1st contract after his ELC (although McDavid gave us more term). The comparable for Drai was Kopitar, and I can tell this because the cap percentage of that 1st contract was very similar to Drai's
Btw, I'd like to point out that Kuznetzov's contract is better than Drai's as of today. A lot of people looked at that Kuznetzov contract sideways at the time (wasn't there also a comment from the GM at the time about how he overpaid because he had to?), but the guy was arguably the best player on a cup winning team. If he were re-signed today, it would be for 9 million, if not more.