I like him a lot though I'm not sure where his ultimate upside is. What made Butler so good is a similar skills toolkit to what Davis has, but in a 6'7 230 pound body. Jimmy developed into a beast partially due to his ability to get into the paint and get calls. Davis' ability to shoot this well at the NBA level has surprised me (he was a good, but not great college shooter and adapting to the longer 3 pt line can be a challenge for non elite college shooters) but he's going to need to add a couple more tools/skills to develop into more than a good #3 scoring option (on a good team).
His floor, imo is a more mature version of what he is now. An above average 3&D combo guard (a "combo" guard being someone with a mixture of skills from both the PG and SG position) who can run the break, plus rebounder for a guard, function as a primary ball handler for a second unit. Ceiling, I'm honestly not sure. Maybe Jimmy, but Jimmy is a lot bigger than TD is.