Only peak matters in this confrontation. So how do you rate peak Rog on the day, versus peak Pog and Vingo on the same day? And this holds true for the others as well. That's how you establish the heirarchy going into the Tour and hence team plans/roles. Whether or not things go to plan, however, is a different matter. The starting premise doesn't change.
Grand Tours have become about survival as much as watts, in that respect a team will always favor taking multiple top GC riders to the TdF. It means there really wouldn't be a hierarchy between Vingegaard & Rog in the first week or so unless one is far in front of the other. Jumbo would aim to keep both in contention.
The minutiae of the watts differences between their 'peaks' is contingent on so many variables (small knocks, sickness, stage profiles, weather etc.), i.e. when we're talking about riders with these types of 'peaks' a team will want both to perform & won't really care about the who is better than who at first.
It's not an exact science in any case. It never was.
I think Vinge's level in climbing last year is still underrated to this day. It's not that Roglic was bad, it was Jonas in the shape of his life.
His inconsistency happened multiple times unfortunately but he was saved by Kuss/Wout several times. One of the reasons why TJV is reluctant to give him full support at Tour is exactly this one, too many off days, a lot of times due to poor luck. Also Jonas kinda earned to fully defend his title. What Roglic has though is his fighting spirit and I think eventually that will pay off even in TdF.
I think Roglič has more than earned the right to go to the TdF as a protected rider alongside Vinge. A bit like G Thomas & TGH at the Giro.
If he has the form & mental desire to do the Tour, then there shouldn't be any problem. It also seems to be entirely his decision as well, which shows how much trust he has in the team & vice versa.