Pecking order question

I have a mixed bag of 17 cockerels - all came from a local farm and ranch store - there are some barred rocks, a coupleof leghorns, some RIR (or some derivative) and 6 EEs. They are about 16 weeks old and let me tell you, in the last 3 week it has been a testosterone factory! The RIRs seemed to be aggressive first, picking on whichever chicken looked weakest. Two of the meanest are now "cooling their jets" in the freezer to be enjoyed at a later date. The leghorns never seem to play the pecking order game. The EEs are fine with the exception of one & he is a real son of a gun - just looking for opportunities to pounce on another chicken. In the last three days the rocks turned the tables on all the others, ganging up on everyone - particularly the reds. But my question is about the EEs. As a group, with the one notable exception, they are the kindest of all out there. They are friendly toward me and the other chickens. Two or three barred and maybe that one mean EE are going to freezer camp in the morning - I wish they were a little bigger but I've had it with the aggression. Eventually all will make their way to the freezer. Here's my question (finally). I'd like to keep a couple of the EEs roos but after I start culling the others will my two EEs just move up the pecking order and show the same level of aggresssion the reds and now rocks are showing? In short: Given the opportunity will every roo turn dominant and mean? Sorry for the long post!