Bottom line is if this guy is a budding star, and it certainly appears that way, there's not that many teams that have a 24 year old D-Man doing the things he is.
It's nothing but a good thing for the Oilers because it signals to McDavid and Draisaitl that there are other reasons to stay around besides just each other.
There's not many teams that can offer McDavid a player like Draisaitl to play with (and obviously vice versa) AND also have a young D that's breaking out like Bouchard too, and then you throw in the advantage with 8 year contract term that only they can offer, the fact that now they are in the Conference Finals 2/3 seasons (not many teams can claim that), you have Hyman on a great deal, etc. ... it improves their bargaining position in keeping the big 2 around.