The lingo can be a pain sometimes I listen to everyone's info and make a list of top lb1,dl1,db1 those are usually the top 15 on each position. Lb2,dl2,db2 are 16 through 30. And lb3,dl3,db3 are usually 31-50 that's how I rank them anything out of the top 50 I concider a sleeper pick up if they fall into a starting position later in the year. The other thing in my league (12 teams 4lbs,3dl,2safetys,2cbs) is we separate tge DBS and limit roster spots ( only 6lbs,4dl,4safetys,4corners) so we are very deep on corners safety's and lineman but not to many lbs left. The main thing to remember is that everyone's league is different but most leagues top 20 depends on scoring (tackles and sacks) because clay Matthews in a high scoring sack league is a lb1 or 2 in a high tackle league low sack he is a lb3 or 4 so check scoring and read up to come up with something that fits your league.