Haha. Sounds like you want blood!
Well, for what I can answer, it was designed by Laird and Partners, who served as Gap’s creative directors for many years. So I guess it was done "in-house".
I don't recall reading that anyone took a hit for this, as I wrote, they quickly flipped it to a "crowdsourcing" project, and then dropped it.
GAP, like a lot of retail, is struggling, but this doesn't fall directly on its failed logo - it's more about costs, competition, online shopping, failure to innovate etc. I think the main shareholding family recently lost millions of dollars in valuation.
I never watched Firefly, so I'll leave you to find those responsible for that yourself. Good luck!