Thousand Sons marines

So I'm putting a list together, I'll post it so that you guys can rip it limb from limb. I'm looking at troops. I'm doing thousand sons army so i go to them of course. Their special rules are;

4+invulnerable save(including mark of tzeentch)
fearless
slow and purposeful
the sorcerer commands
inferno bolts

and im wondering if they already have the mark on them or if i need to buy and icon for 5 pnts on the aspiring sorcerer.

uh yeah, in the other troops choices for specific legions they have Mark of Blah(included in profile) in there special rules part.

im pretty sure i have to buy the icon buy figure if somebody can prove me otherwise and save me 5 points per squad it would be worth a shot.

They already have the mark, It's included in their profile.

Although you don't get anything else rules wise, other than what is seen there

Plus withe new list, the sorcerer that commands the units doesn't even have the option to buy an icon... and there is no armoury that he can select from.

says i can give 1 member of the squad a person icon, so i can give it to the sorc leading or just a random marine

A personal icon is different. See page 81 of the codex.

It works like a teleport homer (one that works with demons too)

The reasons it has the whole buy an icon thing is so you can get them on the other things. The Berskers, Thousands Sons, etc are ALWAYS devoted to there patron god so they automaticly(sp) have the Icon and have it in there profile. Actually I think it is common sense

No, the reason you can buy an icon is so that you can summon things in to it. Personal icon that is.