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