First things first, he needs to be neutered. As you know, it is pretty much impossible to bond unneutered bunnies. Will he calm down afterward? There are no guarantees. But you might find yourself pleasantly surprised.
For right now, it would be best to keep them separate. There is no need risking a fight. Bunnies can and do hold grudges if they get into a bad fight. Get Jefferson neutered, let his hormones settle, and then ease into bonding. You may find it helpful to do some pre-bonding to get everyone used to the smell of everyone else. This can be accomplished by swapping litter boxes, toys, and blankets that have their scent all over them.
Stress bonding techniques can be useful with bunnies who do not take to each other right away. There are different methods, but the car ride and box/laundry basket methods are the most popular.
The HRS also has some tips for tough bonding situations: https://rabbit.org/journal/4-4/tough-bonding.html