The draft takes a very, very, long time. Trust me, you would not want to draft all 53 players.

As for the pre assigned players, that is based off of how much play time that had last season. So since players like Jaire, Khalil and Tre all played less than half the season, they would be randomly assigned to teams.

I believe this site is relatively new, and while there are many problems with it, I'm finding it rather enjoyable. So id say just have a little patience with the site and the people running it, and just enjoy it for what it is.

Also if you're new and want to have a sense of what a fully drafted team is like, just ask one of the people helping to run the site if you can adopt an abandoned team