You really just don't think before you post.
..... I did, I am, and comments like that will make me annoyed.
Traitor guard have daemons that can be summoned off of icons embedded in the unit?
Traitor guard have the ability to add mutant squads?
Traitor guard have aspriring champions that can be added to mutant squads?
The game has altered so much since that point, nearly all of that is meaningless. Icons as you describe don't even exist in CSM, anymore.
You can ally Guard with CSM or daemons, just fine. Almost all those models are still valid, and you could use them together in the army.
Do you work for GW or are you just making more stuff up?
I can be sure of something without working for GW. At least I think I can. I dunno, I'm not sure anymore.
Look, instead of getting all huffy about it, you want to place a gentlemen's bet, or something? You seem miss your lost and the damned quite terribly, and misery loves company, I guess, or something. I am quite sure the tau codex will have Kroot, and vespids, for that matter.
What do you want to bet?