sorry for my bad english
Quite often in ZvT games(with pro-gamers: larva, Soma, SK etc.) I see the following.
Zerg player attacking the 2nd or 3rd expansion of the Terran with a large number of troops does not completely kill CC. Leaving him about 600 + / - life points.
Why they can 't I take 1 Queen (which is worth like 1 mutalisk) and infect CC at the end ?
Leaving CC to a Terran you leave it expandable, infecting CC you deprive the Terran of expandable.
Or am I wrong? If it was that easy, Zerg players would probably do it, they're not stupid))