Im pretty disappointed. Basic issues: 1) he’s using 17.8mm rims. 2) he’s testing only 33-40mm tires and frankly seems more interested in the CX stuff he’s lumping together with gravel.
... but Conti need to build a tire will at least measure out at a true 40 and preferable 42-43. It’s the fastest proper gravel tire in the test, though I wouldn’t use it on courses with serious sharp rock.
Realize that most of us here are US centric, and these tests are European. 33-40mm makes a LOT more sense in Europe – given the terrain and the CX popularity. This isn’t a US based gravel test for US roads. Keep that in mind. His rim size is the European standard for testing.
If you want variety, I can't tell much difference between the G-one Alround and the terraspeed in reality. (well the G-one is amazing in cold, wet, and snowy conditions). The biggest difference is the G-one is in a multitude of different sizes and tread patterns.
FYI, if I need something bigger than my 40mm terraspeed, I'm on my 50mm Furious Fred - super supple, light, and fast tire though I wouldn’t use it on courses with serious sharp rock, lol).