EQS had spent much of the race riding hard (cf Lotto who did the minimum necessary). Then it was Renshaw who took Cav up to the front early, died on his feet dropping Cav off early. Cav had no choice but to go, giving Greipel a perfect lead out.
Sprinting isn't about who can go fastest, but who dies least quickly. Cav died 30m too early and when the legs go, they are gone. It wasn't sitting up but there was nothing left to give.
Cav made the best of a bad job, the fault was Renshaw's and Lotto getting essentially a free ride.