first-round corners should have unique measurables to me, because that's a position built on athletic profiles. Arnette doesn't scream out elite in any category: 6'0 but with only 30" arms (below average) and 4.56 speed.
his technique in 2018 was "turrible"; just held like crazy and got stuck in all the awkward positions a corner should never be in.
caveat, I didn't watch him super closely in 2019 -- casually it seemed like he improved a ton after Ohio State got rid of their poor co-defensive coordinator set-up in 2018.
Mayock's thing seems to be reaching for whatever player he wants and not really caring about any perceived value, however.