Sorry for not getting back sooner, been dealing with the hurricane. In this keeper league you can keep zero players or all 13 roster spots. I've had years where I kept all 13 and others like last year I kept 4 and won the league. It varies.. Each spot you keep a player you forfeit your draft pick for that round and all the unkept player go into the draft pool with the rookies some of the better ones I listed above.. The teams available didn't keep but 1 player so they have high picks as listed.
My keepers last year were Jokic, Kyrie, Horford, and Kyle Anderson and I drafted Jeremy Lamb and Montrez Harrell in rounds 5 and 6 and won to give you an idea of what's generally available. There are no dominate teams. I've won two titles in 9 years but they were spaced apart in years 2 and 8. There is only one other team that has won 2 titles and he quit and 4 other owners with titles.