Maybe the weather being suddenly warm messed a bit with his legs, or he just started feeling bad at some point on the final climb. The plan was clearly to fight for the stage win with him.The problem is the fact Jumbo paced for the stage. If Rog was hiding an injury, the tactics would have been completely different (if only to keep the pace down).
What happened was inexplicable tbh & I have no explanation. The team knows his condition more than anyone else, so there's some other reason this happened & it's something they didn't expect.
Incoming Roglic downhill attack on Giau (or even Cibiana)? Both Thomas and Almeida aren't the best descenders.