He wasted tons of energy because he lacks the skills to ride on gravel. Had should've been in the front of the group when Ineos attacked, but he lost positions because he can't ride on gravel, and he was dropped. Getting back cost energy. In the 2nd and 3rd section you could again see him wasting energy, losing positions at every corner, having to move up, losing positions again. After a while he was always dangling at the back until he finally dropped permanently.He got dropped in the first sector where he was able to be paced by his team mates. Stayed on in the second, which is the one full sector where he dangled on the backend of a group, then stayed on for a little less then half the sector on the third one, but since i didn't want to calculate whether it was 1,2238792 or 1,5 i rounded it up in his favor.
I am sure he needed to put in a lot of effort today because he is simply not that good at racing in these conditions, but he did not dangle a lot on the backend of groups.
Anyway, press release by the team states he felt his legs got drained and didn't have the power. He says he didn't have the legs and thanks his team and particularly João. He also says "Still a long way to Milan". His sports director stated the gravel sections took their toll on his legs, and that he wasn't actually that bad. Personally i agree with the latter.