Hasn't Cav shown that power isn't everything in winning throughout his career? The story goes that he wouldn't have even made team selection when he was younger because his power numbers were underwhelming. When you hear him dissect the sprint after winning, it's clear he's using his experience and knack to get to the line first. It's not just that he has the most power among the sprinters.
And in both his 31st and 32nd wins, his leadout has been much diminished well before the finish. They've been able to keep him out of trouble but not been there to drop him off at the last, best moment for an easy cruise to victory. They had to chase down the break for #31, were slower than Alpecin-Fenix's train and Morkov bailed early (to avoid being boxed in by them, according to Lanterne Rouge) for #32. Cav did the rest himself. It's more impressive than the perfect leadouts that DQT managed earlier in the year for him and Bennett.