You have no proof to suggest they're faster, Ulquiorra doesn't need to fly away to avoid the quakes, even so his flight speed is clearly faster than hypersonic+ he was blitzing a Masked Bankai Ichigo whilst flying
Real world quakes don't affect islands that far away so quickly. You can't really "dodge" the AoE of those quakes. He is pretty much introducing vibrations into the very air itself. The only argument to be made is if Ulquiorra just flies as far away as he can right at the beginning and spams nukes, which isn't ic.
Scan of this please.
It's even more impressive than I remembered. Seem WB intercepted him after he was already in his light form and starting to move.
We have no understanding of that title whatsoever, he could have achieved it decades ago and merely held onto the title without remaining the strongest. Akainu has what speed feats?
Whether old WB was stronger than the likes of Linlin or Kaido is quite controversial in the fanbase, but he was still portrayed as a top tier Yonko, in spite of his age, and mid diffed the strongest Admiral (Akainu) while half dead himself. I think it's safe to say Kaido can't blitz him as casually as he did Boundman Luffy. So at the very least he should scale above current Boundman Luffy in speed, if not to Kaido. That level of speed is more than enough to keep up.