He's lucky that Decathlon isn't going to be pragmatic and won't send Seixas to the Vuelta like most of the young riders who are making their GT debut in the Vuelta.
Roglic is at a point where he wouldn't beat emergent riders. Lipowitz is proving more and more every day that he's already surpassed him. But the fact that the World Championships are in Canada this year means neither of the best GC riders will be at the Vuelta.
Roglic is still superior to the B-level riders in the peloton. The only risk would be if someone like Ayuso or Del Toro takes that step forward in three weeks, and they won't be there. Vingegaard because of the Giro, and Pogacar because of the World Championships won´t be at the Vuelta either .
Almeida could be a tough rival without the Tour, but Almeida isn't a Grand Tour winner; he has to be in top form and have everything go perfectly. There have been many Almeida who, for various reasons, haven't achieved it. I would never bet on him; even if his main rival at the Vuelta were Felix Gall.