That isn't true at all. Chelsea have Hazard, Willian, Ramires, Schurrle and even Costa and Oscar have shown his ability to take players on at a decent speed. City haven't as much pace, but you're still neglecting Aguero there. And following that, players who are able to take players on are Silva and Toure.
Pace helps because without it, we're predictable. Di Maria is our only 'wildcard' in the side, the only one able to take players on and give us something else. We are very possession oriented yes, but even then LvG is very pragmatic and his WC side was pretty dependent on Depay and Robben.