Who even cares about "who" the strongest is. Bike racing is about who crosses the line first, not who has the best numbers.
If there was a real, proper Rog versus Vinge GC battle, both riders would use their respective teams & strengths based on their own qualities. I could imagine Vinge dropping big attacks on the longest highest altitude climbs, whilst Rog would go hard on the punchier terrains. The point I'm making here is when teammates are 1, 2 & 3 in GC, it's not just about who the strongest is, it's also about who got the lucky roll of the dice. In this case it was Kuss.
But there was also another scenario where an echelon or split in the bunch happened & Vingegaard found himself ahead of both Kuss & Rog in GC, at which point he'd be the winner.
It could still happen as well. But we won't know who was really the strongest between the 3 of them because they're not going to directly battle each other.