Gervonta would kill him, Conor Benn would be killed in the ring if he fought Tank, 100%. Especially now Benn has lost his power since he stopped eating omelettes.
Benn weighed 170lbs on the day of the fight with Dobson. No doubt Davis is the better fighter and he beat Barrios at 140lbs, Davis is by far the superior fighter but the size difference could prove too much. I'd favour Davis though.
A relative no-mark, just the sort of fight Davies likes... Throw in a rehydration clause at 140 just to make sure and it's entirely plausible.