Some guys are just fast. Irrespective of gear. I have seen different playerse with same gear move differently. Better internet and latency helps.
That seems worse then, not to mention highly and easily exploitable. But I think you might be right. I do also think there are some techniques that (like constant parkour) that help. But a guy with the fastest armor in the game shouldn't be able to also tank 4-5 medium bow shots, and melee hit (from me alone) and still be fine and zooming.