It is generally better to move the cock into the hens pen so if you are having a problem with them establishing the pecking order put the hens in a different pen for a while then introduce the cock. All of them will have to establish the order at some time but they do not generally hurt each other, they want the other bird to submit. If you do not have extra pens I would try letting Professor in for visits making them longer with each visit. (Or let nature takes its course and let them figure it out.)