One thing to note is the GP5K casing, while not amazingly flexible, does stretch considerably and permanently. For all the trouble I had mounting them on a set of wheels, they were extremely easy to remove later... The keyword should be casing/sidewall stiffness.
I really wish Jarno would test the "TLR" tires in the Hutchinson Fusion 5 family. I'm curious to see how the Galactik TLR 11Storm stacks up against the TL non-11Storm he originally tested. We know it has better wear/endurance and we know the TLR measures about 70 grams lighter.
That said, the fastest tubeless tires do have the thinnest casings outside of a couple anomalies.
Corsa Speed 1.0 = 0.85mm
Grand Prix 5000 TL = 0.95mm
Fusion 5 Galactik TL = 1.05mm
Pro One = 0.90mm
Yksion Pro UST = 1.10mm
Another tubeless tire with a very thin casing Zipp Tangente Speed RT. BRR needs to test that too!