I imagine the foam on the face of the case is substantial enough to prevent the body from rocking forward enough to put any pressure on the headstock.
This is not Gator's first rodeo building cases for Gibson instruments.
The stated Gator dimensions are almost exactly the same as Chromacast's bass case except for a fourth latch, four extra screws on the compartment sides, and an additional top strap.
You can shoehorn an Epi bolt on in one but there's no room for error due to the 13.8 inch internal width/15.3 external width. I'm assuming a 'modern' Gibson TBird is around the same dimensions.
I guess I could remove a few inches from the headstock on my vintage 'birds...
Cataldos, including NRs with 2+2 headstocks, do fit in the Chromacast cases with around an inch to spare at the headstock end.
They also fit just about anything that fits in a Fender sized case. I buy them two or three at a time from DPS music, $55 including shipping when you use a 15% discount code, $65 without.
http://www.godpsmusic.com/products/chromacast-cc-bhc-bass-guitar-hard-case-1They're light with better tolex than the discontinued Epi cases but also not as wide, deep, or long. Not form fitting either. YMMV.
IMO Gator doesn't 'build' those cases, they source them with their spec'd improvements from whoever supplies Chromacast. It will be interesting to see what the cost will be.