I have never played in a dynasty league, however, I believe that in this type of league, all yours players are keepers from year to year. In our keeper league, you only have the ability of keeping two players from year to year. Your keepers are based on their draft slot from the previous year or, if you choose to keep a free agent from the waiver wire, that player is automatically given a 7th round grade. For example, I picked up Alvin Kamara last year off the scrap heap and I want to keep him this year, he is assigned a keeper value of 7 meaning that during our draft, Kamara will be my 7th round draft pick and will be unavailable for any other managers to select. I like it because you can keep some of your best players from year to year, but there is enough turnover that everyone has a chance of winning each year too.