We dont know if Pogacar can improve his level, becouse he is really young, or not...The level he showed last year and this one so far is really high, but Froome best level as well....I think Froome could back close to his best level..but if that happen he will need luck to beat Pogacar. Froome would be happy to have option of podium in one of the GTs...But if Pereiro won a Tour you never Knows..you need luck and circunstances...The level Nibali had when he won the Tour I think is still possible for him....today he is far of that, but I think he will show a decent level at the end of the Tour and better at the Vuelta