The Deceptikuta is an alliance of Decepticons and Makuta that has ties to the Confederacy of Independent Systems. On November 27th, 2009, General Grievous secretly met with Teridax and Megatron to propose a mutiny against the Autobots on the Decepticons' part and the United Villages, Piraka, Dark Hunters, Barraki, Rock Tribe, Sand Tribe, Baterra, Sisters of the Skrall, and Element Lords on Teridax's part. The secret alliance proved useless, for soon, the Autotoa alliance formed. The alliance went public on December 1st.
The Devastator Issue
Devastator, as we know, is formed of seven, sometimes six, Constructicons. Well, since Scavenger had joined the Brotherhood of the Bee, Devastator could not be formed. Dirt Boss suggested Demolishor take his place, but turned it down, for he was not adapted to combiner technology. Now, the Deceptikuta had no ultimate weapon and had to come to Grievous for help. Grievous agreed to be their new ultimate weapon, but only if he were to become Decepticon general. This was agreed to, making Grievous 4th in command, behind Emperor Palpatine, Starscream, and Megatron. As a gift, he was given the remaining six Devastator Constructicons (since there were others besides) to do his bidding.