Just a few quick cents from someone uninvolved and uninvested.
The whole point, @"Darkstar_Spectre", is that canonically Kusari and Corsairs are not allies, but that they are trying to become allies. (Kusari and Corsairs wanting be allies is silly but also an entirely different matter.)
While FR1 does seem to be a bit of an issue here, I find that nipping this little conflict in the bud would ruin an interesting opportunity. Corsair factions feuding amongst each other seems like a very Corsair thing to do to me. I would also not be the least bit surprised if this New Corsair Order (or whatever they're called) was created specifically in response to TBH's and DTR's attempts towards diplomacy with Kusari, and that feuding with them is exactly what they are after.
I'd let this play out a bit further and if the New Order or other affected indies take issue, they can go ahead and cite FR1 themselves.