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Just came up with a theory with the zombies...
We all know that:
Headcrab + Human -> Zombie -> (Op4) Faster Zombie
We all (i hope we all) saw the E3 2k4 Videos where we saw a fast zombie that jumped far...
...i think this is another step in the zombie evolution:
After awhile, when the Headcrab get's more control after the victim the zombie gets faster and stronger (Headcrab get's more control over nerve system)
But, the headcrab canno't prevent the host from decay, so the zombie gets fast, stronger but more fragile due decay...