That's a great, informative response. And thanks for correcting my mistake about how it works.
Your explanation now has me wondering about linear forces. Other concussion-reduction technologies (the ones used by Kali, POC, and 6D, for example) are designed to reduce linear forces, not just angular ones. (That was one reason I had little faith in MIPS.) Is MIPS Spherical designed to reduce linear forces? Either by the elastomeric attachments or some other way? I recognize that variable-density-foam shells (such used in the Tyrant, Super DH, etc) do that, I'm wondering if the MIPS Spherical feature itself does too, or whether it reduces angular forces only.
I own a Bell Super DH, another MIPS Spherical helmet, and it's very clearly bigger than other helmets. Bigger = larger shell, larger outer diameter. The 6D halfshell, which uses a different dual-shell design, was the same. By contrast, single-shell helmets like the Kali Maya/Interceptor and POC Tectal Spin aren't noticeably bigger. I haven't seen the Tyrant in person. Are you saying that, unlike the Super DH, it isn't bigger?