Yeah, I forgot to mention the system--UCLA's system evens out the usage rate and their team was pretty deep this year so Holliday couldn't do much, and for a freshman he's humble, quite intelligent and seems willing to learn--those are all points in his favor. Assuming that he pans out, his skillset as a ballhandling guard who can play defense on two positions is fairly nice as well (he's not quite there yet). And, it seems like he's the type of guy who could potentially markedly improve with another year or so in college, because of his character.
But when it comes down to it, I don't know why GMs want to reward him like this by drafting him the lottery. It's not like a Russell Westbrook case--Westbrook actually put up legitimate stats and had elite NBA athleticism on top of the defensive potential, and really inched his way up the boards during the stretch run--Holliday put up poor stats for an NBA prospect, has average athleticism and can only rely on his defense as his real saving grace because the other factors are such unknowns.
As for the point skills, there's obviously potential here, but as I said before, he's shown himself to be a fairly poor offensive player at UCLA, and while he's a fairly good passer for SG standards he's just very average for PG standards. The system might be pissing him off, because despite having an open road in terms of usage rate at UCLA next year, he's still leaning towards the draft--so I have a feeling that his passing might be better than he's letting on. So the passing might improve as he gains confidence, gets better teammates and plays in a more open system that the NBA presents, but between some turnover problems and the lack of a good jumper I think he's going to have some problems developing this.
I have a feeling scouts want to draft him, as I said before, because of what he did in high school, because of his versatility/defense combination, because they may think that he can make a marked improvement by playing on the fly in the NBA. But personally I think that's the wrong way to draft, and he should be going at the teens in the most--I still see him as a systems player with an average ceiling at best, and he still hasn't hit half of that ceiling with the stats he's putting up.