Brennan not as fast as the top sprinters on the flat, and the problem with the tour would that he would have to deal with VDP, De Lie and even top form Roglic/Pogacar on shorter uphill finishes if there are any, a far cry from APP and Artem Schmit (not looked at the parcours). Plus he's 19 and likely would be dead on his feet. Vuelta definitely as a first-GC.