Last time I felt "that may work" about two-headed sprint squad with top sprinters at the Tour is with Kittel/Degenkolb, just because how different they were, although I don't think Degenkolb ever managed to win any when he had the priority (?), but it just easilh made sense (I think they even slipped Veelers into the top 10 of sprint stages once or twice).
Never felt the confidence about any other team since then.
Never felt the confidence about any other team since then.