You mean the 8th espanda and no he was not the fastest espanda (sonido). Ulquiorra and Starks were faster then him by a MILE!!!!!!!!
Grimmjow and Hallibel have the speed feats to argue and win the argument that their faster.
Here's the thing I think people forget about speed feats. There's a difference between overall speed and speed techniques. Cloning/after-images is a speed technique, it's not indicative of overall speed. The fastest characters in Bleach: Aizen, Ichigo, Yama, Shunsui, Starks, Ulquiorra, all have amazing speed feats; but no cloning/after-image techniques. Why? Cloning/after-image is more of a technique, bot indicting overall speed.
Yama could do that to almost everybody. Did you see his bankai? I'm starting to feel like there was so many plot-holes, Yama should have gone bankai against Aizen when he had him cornered. But I guess Wonderwise would have interfered regardless. Yama just stood there against Juha Bach, Bach didn't speed blitz him. He just accepted his death.