I think EF and Carapaz did everything right today, can't really put the blame on them in any way. I mean, Carapaz has won this race already and finished on every GT podium. Coming 2nd or 3rd in the great schemes of things makes no difference whatsoever, so it was obvious he should go for the win only.
Letting WVA in the break. Yes, in hindsight a mistake but I think the EF team was just to bad to have meaningful control over the breakaway anyway. I think someone from Visma in the break was the lesser evil because the possible alternative would've been someone from UAE and then you're even more of a risk to nullify an attack on Finestre.
Nuking the lower slopes on Finestre was the right choice: EF has been terrible this Giro in the mountains especially compared to UAE, Carapaz was basically always isolated with maybe Steinhauser hanging on for dear life in breakaways ahead. There's no way they could've hard paced a significant part of the climb that would've dropped the UAE doms. The only thing they could do was what they successfully pulled off: Put such a hard tempo at the base of the climb that exploded the group and forced Del Toro to go with Carapaz right away. I mean Carapaz didn't even have to go out of the saddle and Del Toro actually had to close a gap, nevermind Yates and the rest of the GC guys who had a gap of basically 20s right away. And Majka, McNuggets and Co were basically send into irrelevance from that moment on.
Now as for riding with Del Toro in the wheel/letting Yates go, I think he was put in a lose lose situation either way. He tried to find the right mix in my opinion, close Yates the first few times and attack yourself. But once it became clear that Del Toro is only interested in his wheel, he had to let Yates go at some point, can't do everything yourself with potentially the UAE doms coming back eventually. And if Del Toro is happy to lose the race like that you have to let that happen. I think he even pulled too much on Finestre, especially on the later parts when it became clear that you're not closing Yates anymore on the climb itself because the gap became to big.
As for UAE: Disasterclass in all almost every aspect. Why let WVA in the break when you have the strongest team to control. Even worse: Why give the break almost 10 minutes so you guarantee he even makes it over the top??? Performance wise they have been terrible in this last week outside Del Toro and Majka. I do understand not jumping after Yates immidiately because obviously you don't want Del Toro in a situation where he constantly gets 1-2 attacked by Carapaz and Yates but you need to act way earlier in terms of damage control.
From the sounds of DTs interview, I think they completely overestimated Carapaz and just slept on Yates. Carapaz is a smart rider but he's very "human", he has basically no alien performances and kind of never just puts 2 minutes into everybody. If you're THAT worried about Del Toros abilities on a long climb put someone in the break to do damage control after Finestre. But if you believe in his overall climbing abilities you can't just solely focus on Carapaz.
Overall, very happy to see UAE lose although I have nothing against Del Toro. Sad to see Carapaz not succeeding, he has been the most agressive and entertaining rider this race but in a way I'm also happy for Yates to close the chapter after 2018. Despite him riding for Visma.