Live bodies can certainly block human spawns. I've seen this used as a griefer tactic. Perhaps if the telepads telefragged
It would also be funny to explode a tyrant who is in the processes of stomping one.
I used that as a valid tactic once

Humans had built a small, remote, cramped and very very hard to access base. With some work, I was able as a dretch to enter, kill one or two humans and die because of a turret but mostly because of the ractor. The only safe place was on top of their only telenode

it just happened that I was able to kill the last human and land on the safety of their telenode before they spawned. Problem was I was a dretch and if I moved only one inch, I would have been killed by turrets or the reactor

I just had to stay here and wait until the rest of my team decided to morph to marauder and do a few suicide runs on the base to kill the reactor.