I agree with your decision to keep working with Bruno and give him some time. He was the beta rooster after Jefferson for a reason, and with a little effort, you might could teach him to be beta behind you as well.
Also, cockerels go through a butt head phase between getting their hormones and growing fully mature. You won’t really know his true personality until he gets over that phase. If he doesn’t turn into a pleasant rooster within a few months, then it might be time for freezer camp.
You mentioned you have another, younger cockerel growing out. It would be worth waiting and watching how the dynamics of those two play out. One might be a better choice to keep than the other. If you have enough females, and both boys get along, it might be worth keeping a spare rooster. Also, if enough of those eggs hatch out, you are certainly going to have more boys to choose from.
Someone mentioned about marking the eggs under the hen. For the best results at this point, I would candle all the eggs, and remove any that seem to be at a different stage of development than the majority. And cull the majority down to 12 or fewer, depending on the size of your hen and how many she seems to be able to cover.
Mark the eggs, and check every day to remove any new ones. If you don’t control the number of eggs she sits on, what will happen is that they will get incubated unevenly, and many or all of them could die when they get pushed to the outside and cool off too much. Ones that don’t die could develop deformities and not hatch properly or die after hatching. At hatch time, you could find yourself with a lot of dead eggs or a tiny percent hatch rate. But with a proper number of eggs, most broody hens are excellent incubators and hatchers, and you should have a good chick experience.
I’m sorry this is getting so long. One more thing to consider is to isolate the sitting hen so the others can’t have access to her nest. Because when the chicks start to hatch, the mother may or may not be able to protect the first chicks from the other hens while she is still hatching out the later chicks. The other hens WILL kill the chicks if they can get their beaks on them. It’s not their fault, it’s just instinct and they can’t help their prey drive. The mother and babies need their own space for at least a few days until the chicks learn to obey their mother and hide under her when she calls. Then she can protect them and raise them within the flock.