Important point.
I personally would not follow that method because, though I do intend to replace my breeding males regularly, I'm not turning them over as fast as you are -- currently planning on keeping them active from 18-months to 3 years so as to enable intentional line-breeding.
My plans may change, but I'm going to be cautious in a way I needn't be if I was planning on turning them over rapidly.
There is no "one right way". But there are plenty of wrong ones. All we can do is share the science, share trhe experiences, weigh the percieved risks, and decide for ourselves - then adjust if we find it not working for us.