Malcolm is a joy to watch and a great Illini, but there's a reason it's so hard to think of a good NBA comparison for him. He projects as a below-average athlete, defender, and ball handler for an NBA 2/3. He'd be an average shooter and above average rebounder, but that's about it. His best trait is that he has a nose for the basket - he's a natural scorer.
If Brandon Paul can't make a regular season roster and Rayvonte Rice doesn't even get a sniff, I just don't see it for Malcolm. Remember, guys like Dee Brown, Kenny Battle, Marcus Liberty, Deon Thomas, James Augustine, and Frank Williams were borderline NBA players (regardless of whether you think Deon or Frank could have done this or that, ultimately they didn't). We've had six "good" NBA guys over the past 40 years: Derek Harper, Eddie Johnson, Ken Norman, Nick Anderson, Kendall Gill, and Deron Williams. All of those guys could destroy college opponents at will.