Wow! So much to consider in all of this. I cannot section them off and really do not think a break is what they need. I think he possibly needs to learn and being left by himself will not help that. In fact I think it might make him anxious and therefore less agile. Will he learn in time (before he injures an eye or two) is what I need to consider.
The good news is that yesterday I saw him on the back of the little girl again and finally this time he was holding her neck. As far as giving the girls a break, again I think that is not possible with my set up, except for an hour or two here and there. It's not like he wants to mate all day. He seems satisfied with a couple times a day - once first thing being left out of coop in AM and later in the afternoon. They sleep together in the coop but the girls huddle together on the floor and he is on a shelf above. I think he will balance this out between the 2, as another thing I hav seen is that he started to mate with the little one (Fern) in the afternoon and switched mid stream to the other girl (Luna). She finally has begun to let him but you can see she's not as experienced as Fern. So I guess they all need to learn and so I perhaps I need to stay out of the way. They are a team of three and roam that way!
Having only 2 hens will determine whether I need a drake or not. If he learns how to be with them, he will stay. I really do not want a third female and would only get one, if he were to leave. Originally with straight run, I got drakes and was fine with just 2 drakes. It's really not about the eggs for me. It's about the free ranging bug eating and now the company. I did not "get rid" of my other drake because he mated improperly (I had nothing for him to mate with). I re-homed him because the dynamics of 2 drakes and me did not work out. He was out of control and I did not have the inclination to deal with his attacks. I'd have been a bit crazy to have continued to do so!
As far as this drake (Jupiter) goes, he is almost always very polite with me and knows me as momma duck as I have always been.
Btw, all three are very good flyers and a dog crate would not separate them.