Attempting to be roughly scientific about this. If JRod weighs in at 57kg, and Froomedog 70kg, and there both have the same power/weight (similar in the climbs so far so let's say roughly correct). Then over a flat TT Froomers would be expect to be (70/57)^(1/3) faster. So 3.5 mins for a 50 min TT. With the climb being a quarter of it, I predict 3/4*3.5= ~2 mins 40. If the descent is actually quite technical and you can't power along then maybe we can give JRod a bit better performance but I think given the descent is steep at first then fairly level. Factoring in the descent I'll say 2 mins 30 for Froome, and Froome beats Contador. Feel free to flame is this is completely wrong.
Castroviejo leading so far with 54:10 so at least the 50 min prediction looks roughly right!