I have no doubt that it is him. I do doubt that he has personally seen all of them play.
Of course it's me. There are several ways to see them all play. You guys are correct about the lack of AAU, which does make it difficult to see all of them in a short period of time and makes it even more difficult to rank them when a lot never go head to head.
That being said, there are two events in the summer (during the live recruiting period for D1's in July) where I can see the majority of the top JUCO players going into their sophomore year. One is Jerry Mullen's JUCO Top 120 Camp, which is normally held at Oral Robers University in Tulsa. It has been moved to St. Louis this year due to the NCAA's new ruling on AAU and other exposure events not being allowed on a D1 campus. The other is the All American JUCO Showcase in Vegas, which is held during the same time as the Adidas Super 64 and other high level AAU events. This is similar to the Mullens event, but will sometimes have more kids from the out west.
Another way for me to "see all of them" are JUCO Jamborees. These are pre season events that are held in October and are considered scrimmages. These are team events that have more than 60 teams from across the country. There are several of these in different regions of the country. There is a large one in Dallas that has the best teams from Texas, Kansas, Oklahoma, Iowa, Illinois, etc. There is also one in Atlanta that has some of the better teams from the southeast. Some are out West as well. I'm sure you get the idea.
Of course you still have regular season games, large holiday tournaments, conference tournaments, regional tournaments and the NJCAA D1, D2 and D3 National Tournaments. Keep in mind I do see most players as freshman, throughout the summer, pre season events and their entire sophomore year. After that the final rankings are released.
Somebody also mentioned film. They are correct as well. This is not a 2 minute highlight film with Jay Z blaring. Junior college coaches send me full game film, sometimes several from each school. Film is usually an even better tool to evaluate b/c I can actually stop and rewind. I can also keep an eye on the same player for multiple possessions, then rewind and take a look at another player. Many schools will also stream their games online as well.
Sorry for being long winded, but I figured my boy Clones 85 needed a detailed explanation. I hope that clears things up for everybody. There is a decent amount of travel involved, but the summer events and the JUCO jamborees allow me to see hundreds of players in two or three days.