How old are these cockerels and how many birds do you have? And how many cockerels/roosters?
If you seriously think about breeding to SOP/ASA as your goals, you will have to build bigger/more runs and coops. This will enable you to have grow out zones for your younger birds away from the...
They look to be only 4 month old, so still have to change to their adult plumage.
The wings and tail feathers are the last to change, so hold on and have patience, just like @sourland already advised, it is much too early to cull judging them by their actual looks/performance.