If your argument is "He can't actively use it and it might be random" then that's still limited, but for other reasons. Regardless, I really don't see why Ben 10,000 would not know about this feature, considering he's suppose to be an expert of the Omnitrix.
He can't actively used it, the watch can.
Even beikg able to turn in off or on would be worse than what actually is: Everything is done by the Omnitrix. And being an expert doesn't mean he controls it all, especially if we take into consideration how it lacks all of the AF functions.
I think the example is just misleading wording wise, so it's better to cut it off.
There's no reason for it at all.
Upgrade lacks Mana, she can't track him cuz of it.
You prove it's just straight up redirection, I in fact think we should not give characters abilities off random cards in a game that have no greater context for them, with there being rather easy explanations in the mainline media.
Not a game tho, Thérèse are promo cards that came with a game, but not the game itself.
The scan
literally says he merges his DNA with the other aliens, also if you're arguing that the Omnitrix has an entire pocket dimension inside it and is simulating everything to the point it can spawn literal spawns and recreate mana, Gwen not being able to track him is just an anti-feat for Gwen's range at that point, since it should just have mana in it either way. Really that's true regardless of the dimension since, since the Omnitrix is a device that keeps DNA samples, so unless they're dead, they should have mana.
Except that's not what happens.
The watch doesn't have Mana at all, that's it, it needs to recreate it every time he goes Upgrade or Ghostfreak.
We know that if Mana energy is inside the Omnitrix will start to **** itself UP, as shown in that movie.
The page just establishes it's magical life force that fuels aspects of reality, as far as the scans go I don't see it showing it's literally the soul as well.
Mana is literally the true name of everything, not just its soul or life force, these are just other ways to refer to Mana.
Alternatively not every spell Gwen casts alters reality on a fundamental basis, and some stuff is just not operating on that level.
That's not how it works.
Every spell, attack or thing done by Mana is CM1 as that's the "true name" of every aspect, doesn't matter the action, absolutely everything is CM1.