I'd imagine scouts like what they saw in the tourney from DD, on top of the games we've seen the past two years where he lived up to his abilities. If DD were to show out in workouts against comparable SFs, that could easily secure himself a 1st round spot. I keep going back to this comparison, but Tony Snell, another LA kid, was in the same position last year with New Mexico. He played with two other guards who handled the ball in Kendall Williams and Hugh Greenwood so the ball wasn't always in his hands and was used as a spot up shooter, and a couple dribbles and rise up/shooter just like DeAndre(DeAndre has a nice post game too tho). He would always mix in very good games along with games in which he didn't show up, then at the end of last year he had a great MWC tourney, then went pro and was considered a borderline 2nd round pick. Well, dude performed very well in workouts and showed stuff scouts didn't know he had and had a guarantee from the Knicks with their 1st round pick, but the Bulls scooped him up before then.
Now with DD it will be a risk to go pro since there basically isn't a "testing the waters process" anymore, but DD has been described as a workout warrior, and someone who always looks great in practice but doesn't always translate it to games. If DD looks great in workouts and goes 1st round it will be worth it for him instead of coming back, possibly being inconsistent again, or even worse possibly getting injured and having a setback like he had this season with the sprained ankle and back spasms. Then you run the risk of being labeled a 23 year old inconsistent player who will never live up to his potential. That's exactly what happened with LaQuinton Ross this year for Ohio State(minus the age thing), who finally put it together during an Elite 8 run last year, came back to OSU and was the same inconsistent player, got knocked out in the 1st round, and has now decided he might as well go pro now instead of risking going through the motions again next year in his senior year.