I think I know what Conte is up to. He is trying to withstand Spurs for as long as possible, or get ahead and try and Leicester it to FT. Hazard and Costa are sub options in the first scenario if Spurs tire (especially if extra time comes) . With that Spurs sub bench, the starting XI will have to blitzkrieg Chelsky out of it long before Conte considers using his subs.
If we get completely dry humped today, I hope it doesn't lead to the kind of collapse we saw last season. Imagine the wumming I'd have to suffer on the general board!
My worry about playing all of our home games at Wembley, next season, is that every team who plays us will treat it like a cup final. And we don't seem to be very good at cup competitions, in recent years.