Eh I could give you numerous random examples of trying to do things I noted above where Kroot simply got shot down or got mowed down in melee while not even killing a handful of enemy infantry.
Using more fancy words to turn it into a semi-batrep wouldn't give you any more informations.
Again, I'm not the one claiming something to be good. I'm not the one in need to bring evidence. I'm just countering his arguments by showing how other units who cost about as much do the same plus other things. And I base the things I say not just on theoryhammer but on experience as well.
Feel free to prove me wrong with your own semi-batreps though.