Fabius bile attachment lets me use rhinos somewhat effectively with +2" movement on chosen led by a Master of Possession.

Deploy with the vehicle against the deployment line except when I disembark the Chosen+Leader squad they get 3" before they get to move 9"+D6 advancement(1CP lets them charge afterwards).

I feel like chaos gets enough dakka on their rhino to feel good to take one since its 8 bolter shots and a havoc launcher inside 12" at the cost of 5 marines, but tougher than 5 marines.

See any downsides to this? I feel like its a choice pick unit for the detachment aside from always going Possessed and Warp Talons.
>not my models but they're pretty