right with their predictions, and they spend the majority of their time researching and talking to sources about potential first round picks. They don't spend anywhere near the same amount of time, or put the same effort into researching 6th or 7th round picks, partly because they don't have the time, and partly because they know it's a complete guess at that point

It's a complete guess at that point in the draft, every team's board will be different, at that point in the draft it will be the regional scouts pounding the table for a player they like in their area, and every scout on every team will have a different opinion. Nobody can accurately guess what teams are going to do at that point.

A draft analyst saying he thinks Fua will go in the 6th round, or giving him a 6th round grade(there will be a lot of players with a 6th or 7th round grade who don't get drafted) means nothing.