It's a pretty clouded situation overall. The basic gist is that the brands (Epic Planks/Batalla) had an ongoing working relationship and overlapping history. At some point Batalla were produced by epic planks. Towards the end Batalla were setting up their own ski factory and Epic Planks went out of business, I don't know for sure if those two things were causally related. I have heard rumours that some of the tooling for Batalla's factory was from Epic Planks. As I said, it's a clouded and proof of that is hard to come by because of a lawsuit...
What is known to be true, is that there was a lawsuit involving Bill Wanrooy (perhaps as part of 'Epic Planks' at the time) suing Batalla skis and winning. The settlement ultimately put Batalla skis out of business and Bill took the money from the suit to set up Revision.
Batalla were bankrupt and therefore unable to fulfill ski orders. The owners and brand were also legally bound by the settlement not to publicly comment on the details of the case. I've heard that is why customers of Batalla never got any explanation of goings on. It is also why the full story never came out, but has been alluded to in published stories about the whole saga.
I'm sure there is someone on here who knows the intricate details better than me, but that's the basic story from what I've heard.