[Drax]

but he can work alongside that unit.

its a neat little trick whereby if you place an IC next to a unit, but not in it (and preferably with the unit surrounding it), then the IC cannot be targetted by enemy fire, even by torrent of fire (since he is not part of that unit). and once the IC is in combat, he is separate from the unit anyway!

its often used by Sisters players with Cannonesses w/ jump pack and Seraphim. if the cannoness were placed in the seraphim unit, the unit would lose hit and run, but this method allows the cannoness to be protected getting to combat, but doesn't stop the seraphim from using hit and run once in combat

EDIT: actually though, Luthor has a point. the razorback is a dedicated transport, so only models from the 'owning' unit can use it. if the EC cannot join that unit, he cant go in the razorback