The problem with Jackson is that he's got a very weird skill set - its hard to project into an NBA Lineup with any high level of confidence. NBA likes specialists who have certain projectable parts of their game that you can plug into "known" roles.
Jackson's game exists outside of those pre-defined roles, and so his success will be highly reliant on either upskilling to conform into one of those roles - say he hits 40% of threes this year at a solid volume - OR if he produces at such a high level in multiple different areas that a team is intrigued by the idea of embracing a boom or bust strategy, lottery or in the 2nd round with a flyer on the unicorn-type player. I don't see him being taken at the end of the 1st round, where those are mostly good teams looking to find specialists to shore up specific weaknesses to compete.
To me he's either a late-lottery type for a middling team looking to roll the dice on a unique uber athlete... or a 2nd round flyer by a "good" team who can take a high upside gamble and already has their roster in a good place where Andre wouldn't be relied upon right away, but instead tucked away on the bench upskilling his game.