This is a very hypothetical question. I remember reading an article that said the best Allround riders do not make team leaders. To challange for a tour victory you need to be a specialist - A timetrialer or Mountain climber or preferably good at both. I guess you need good threshold power so you can produce lots of power over and hour climb or TT. So how would these riders cope if they couldn't hide in the bunch the rest of the time? Would guys like Bettini or Hancapi (sorry about the spelling) be the best if there was not drafting or would it make not difference at the end of the day (the cream always rises etc etc)