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So the idea here is a take all comers list using Guard allies with "free" Inq detachment for Coteaz and a super formation for GSC

GSC Superformation

Neo Cavalcade
10 Neophytes 2x Flamer, chimera
10 Neophytes 2x Flamer, chimera
Russ(nakid)
Scout sent heavy flamer

Sub Uprising
Primus
Acolytes 10 w 1 Rocksaw, Icon
Acolytes 5
Metamorphs 5 (claws)
Metamorphs 5 (claws)
Metamorphs 5 (claws)

LoC's
Magus ML2, Crouchling
Patrairch ML2

GSC CAD
Magus ML2
Magus ML2
Neophytes 10 2x Multilaser, 2x Grenade Launcher
Acolytes 5

Allied Guard
Command Squad w Master of the fleet
Vet Squad w Autocannon
Vendetta Sq (2)

Allied Inq
Coteaz

So the deal here is all opponant reserve rolls are going to be at -2 due to the master of the fleet and the GSC formation bonus.
Coteaz allows you to reroll to seal ini or make the opponant reroll his steal attempt. This helps to keep a GSC 1st turn.
The army has a healthy Warp charge total of 10. The main goal is to get the GSC summon power on one of the 3 magus (total 3 chances on one and 2 on the other 2 nearly guaranteeing the power. If you manage to fail on all of them at least the rest of the GSC powers are all fairly good as well but you really want the summon.) Roll on biomancy or telepathy(if you want to try for invis cheeze) for the Patriarch who will join the Primis in a big squad of Acolytes and try for the 3 dice on the ambush table going for the 1st turn assault, also go for the warlord trait to pick the result as well. Vendettas for anti air. Lots of back field units to sit on objectives.

So what would be the bane of this? What would cause it problems?

How do you get inquisitor formation in? If you have the guard one then they would be come of the apocalypse to the Gc. Unless I am missing something else or there is another formation out there. Then I would be interested myself!

He is just bringing him for the bonuses Coteaz gives which is a deal for 100 points. Then he just keeps him outside of 12 inches of GSC models but can still be close to the IG guys

I have tinkered with dropping the guard and replacing with Tyranids in particular 2 Flyrants 2 mucilids and then fill with zoanthrope broods of 1 for extra warp charge. This gives much more offensive punch but you loose the reroll for stealing and the extra -1 to opponent reserve rolls.