Beitashour and Moor are both Free Agents and out of contract.. LA picking a Free Agent would be silly as they would still have to negotiate a salary with them. So they are basically protected.
Ricketts is a Canadian.. and I believe will still count as an international in LA. As such basically protected you don't waste an international slot on a 3rd striker (Bradley I'm sure is bring in bigger guns upfront) And even if he doesn't count as an international... Irwin is open.
Cooper is not really needed and with TAM increases can be replaced without issue. He can hold up play but he takes way too many touches and often looses the ball because of it. Nice player to sub in at the end of a game but... Same thing though selecting a international that may not fit what Bradley is trying to do may not be a great idea. So he is likely safe as well.
Irwin is the most likely person that was left unprotected that would be chosen I think. He is an excellent Keeper that lost his starting place to Bono only because of Bono learning fast and earning the position.
I'd like to keep everyone to be honest. Irwin is a good piece to keep Bono sharp as he develops.