I think team dynamics might be a problem for Roglic even if he is stronger in this Vuelta. Say they drop the field hypothetically in a MTF. What happens then? They will pull together for some time, that's a given. Will they eventually be allowed to attack each other if one of them is stronger? If not, Roglic loses this Vuelta by default in ITT. And even taking a step back - will they even ever be pulling together to distance the field? Or will it always be one man going, the other one tactically waiting at the back of the group of followers? And if so, who will be the one doing the attacks? If it's Jonas, then Roglic is scr*** again...
Best case scenario for Roglic is a very strong Remco. A Remco that is able to put both of them in trouble and then if Roglic is equally strong as Remco while Jonas is weaker, I think that's the best chance he has at taking this Vuelta.
P.S. Before pissing off anybody. My assumption that Roglic would be stronger than Vinge is just that - a theoretical assumption for the sake of the argument. I reality, I have no idea what to expect...