once you get rotary….its a pull
at first id agree, but at maxV the the power applied is vertical, not horizontal (if i aint mixing things up here!?), as mike writes in the FAQs or classics, dunno. so landing in front of the com, the leg is being mostly pulled back by the gluteus etc.(=hip extensors?= pull), then it goes over into a push as you straighten the leg, however not to push yourself forward. the push being behind the com at this point is just an adaption to the high speed. probably the most interesting phase here is the part right under the com which gives you the most vertical thrust to create more hang time.
so its the phase under the com being relevant, and if thats equal to the transitional phase between push and pull (which i dont know) we have a combination of the two being important for maxv running. the pull however being the initiator of the movement up to this point should be more releveant, as the push phase is gradually loosing its ability for upward thrust going behind the com.