It is a combination of all of these things. It has been awhile since I went to any of the camps (last one was 2008), but I've seen firsthand how they work. Hop usually has a list of kids to check out and evaluate, sometimes as many as 35 to 50 at a single camp. Usually these are kids who have at least expressed interest in SU, or are so highly touted that we need to get a look anyway (you can never start scouting your opponents' players too early - seriously, we'll take a good look at other Big East kids that we know we won't get, just so we know what we're up against in the future). Boeheim comes in later in the week and works with Hop to decide on who to follow closest.
From there, the list starts to get whittled down. Things can become complicated - you need to scope out the kid's character - do they have the grades, are they headache off the court? that kind of thing. I remember our recruitment of the Dorsey kid who went to Memphis. We really wanted him, but he didn't even HAVE a transcript, so we backed off. I was told that he would never play a game of D1 ball because his academic situation was so bad. Most coaches tend to put up with more headaches with really talented kids, and back off the headache kids that are middling talents. Nature of the business.
Things are definitely different in some respects these days, obviously we've got new guys on the road, and another major factor is that we can bring in kids with the Syracuse Elite camp. This has been a huge boon to the program. I've never seen it firsthand, but the staff gets an excellent chance for firsthand analysis of the kids. Plus they're on campus so you get to know if they get into trouble off the court, so you know who's a headache right out of the gate. But even more important is the fact that the coaches get to evaluate the kids skill sets - they get to see more than just the games, they get to see the shooting, passing, defensive drills, etc. So they have a better read on if a kid can fit into the system or not.
One of the things that JB does better than just about anyone is getting kids who fit the system. The Elite camp really helps in that respect.
I could probably go on and with this, but it's already approaching a novel.
Mason