Why do I keep seeing Lightning as a Ravager, when she's a Commando?
There are two different Lightnings you can unlock via DLC:
Lightning as part of the Operation XIII-2 Coliseum battle, which is a Ravager and is almost always the Lightning people talk about in guides and such.
Lightning as part of the Another Beginning Lightning's Story: Requiem of the Goddess DLC, which is a Commando.
It appears you purchased the latter DLC but not the former. It's odd that you can unlock two different Lightnings, but that's what paradoxes get ya.