the biggest red flag is just that he wasn't very good in college last year. wasn't efficient scoring, didn't score very much. average rebounder, didn't make plays for teammates, turned it over a lot, had poor hands (which makes sense because it turns out they are abnormally small), made a lot of dumb plays, etc. granted, some of that could be that he began the year injured and the wrist may have bothered him all year, his coach sucked, the offense sucked, he had selfish teammates, he was one of the youngest players in the country, etc. so there are some explanations, but the fact is, he just wasn't very good and i don't know how much of what i just said is explanation and how much of it is excuses.
fwiw, cam was my favorite prospect going in to the college season with how powerful and athletic he was and after dominating for team usa in the summer and all the spring HS all star games, so i never missed a game of his if it was on TV - probably saw him 20+ times this year - and while the power and the athleticism (iow, upside) was apparent, he just wasn't that good (though there were certainly flashes). it wasn't unusual for his coach to sit him down the stretch in close games because they were often better without him on the floor.