Thomas made it perfectly clear he had no intentions of going to the Giro.
Good for Thomas, as otherwise he would likely get "influenced", to change his mind. Anyway, TDF 2020 is likely going to be a real clash of giants. I somehow feel that waiting for the third week, that won't work this time. Strong teams will try to control the race, but at the same time we will get to see some tactical moves, during the whole Tour. Favorites will likely need to do some work themselves, in the final week and in my opinion highly likely before that. Therefore it really will come down to things like having a clear hierarchy and protecting the captain as much as possible. Teams that won't do that, likely won't win.