>>6722013 It's a mutant b-wing.
I wish they woudl stick to the "Scrappy rebels have limited budget" ( which still makes sense for Dis-cannon of "Rebels sem-clandestine poorly funded by Government ) rather than "sleeker" Hell A-wings were sort of seen as replacements of X-wings so it would even make more sense to have a lot those now. Also, with government changing hands it would make more sense that the Alliance forces would have taken over Imperial shipyards and foundrys. I don't care if Star Destroyers had "negative branding" the New Republic would have used em and maybe just given hem spankin paint jobs to differentiate. The tech-creep of the new movies doesn't make sense either.
There's some stuff with the Rebel logo slapped just slapped on ISD's and an Executor and then THIS further down the timeline.