No, it isn’t; you’re just limited in your analytical abilities and haven’t thought this through deeply enough.
Kucherov is neck and neck with McDavid for the best player in the game, but even after Kuch’s next contract kicks in McDavid will still be making almost 32% more than him. That is a massive difference and makes Kucherov easily the more valuable player in a cap league. The Lightning don’t make that trade even before taking team need into account; add in the fact that they already have two elite 1Cs in Point and Stamkos as well as a very good 2C literally waiting at the wing in Johnson and there’s simply zero reason why they would even consider trading Kuch for McDavid.
As for Hedman, we’re talking about comparing the best center in the game with one of the best defensemen in the game. While Hedman is capable of stretches of dominant play he obviously isn’t the consistent force that McDavid is, so in a vacuum McDavid is indeed the more valuable player. But when you look at contracts and team need, the fact that McDavid is almost 59% more expensive than Hedman along with the Lightning needing their Norris-winning 1D a lot more than yet another elite center means that they don’t make that trade either.
Finally, Point. This one I said I wasn’t sure about because it all hinges on what his next contract ends up being. As with Hedman McDavid is more valuable than Point in a vacuum, though the gap is not nearly as large as some may think: both are excellent goal scorers, McDavid is the better playmaker and all-around offensive force, and Point is the better defensive center. In a vacuum you take McDavid but it’s not a massive gap between them, and if Point signs a longterm deal at around $9.5M or especially if he takes a bridge deal at around $7M the Lightning would certainly prefer the slightly lesser player with the significantly better contract given their cap situation.