Linkage layout is what increases the leverage ratio on the epic. To accommodate the new linkage, rear triangles are different on the epic vs Evo. Front triangles are identical.
Yes, we are on the same page. There is no brain involved on the frame I am personally looking at from AWST. This is the one is as seen from post #20 The seller confirmed his rear Brain triangle and EVO triangles are 1:1. It is slightly different from your experience with Airwolf.
The only difference is the yoke and linkage, which the seller confirmed this morning that they've all been updated to the one shared in the photo on the left by ilyamaksimov from post #74. Looks to have been made more 'minimal' or refined. It is still not the 110 or more in travel, but even if it is 95, I think that will be sufficient for my application. That 438 chainstay geo paired with my 120 SID, I think I will be happy.
As far leverage ratio goes, it looks like we are still looking at 1:2 as shown in the '21 Epic w Brain curvature due to that older geo linkage. I like small bump compliance, but also need protection from bottoming out. What shock tune in Rockshox would serve this ratio?