The things I mentioned are not fighting, and sorting out a hierachy is not the same as bonding - it can end with one scared, depressed bunny permanently in a hidy house.
If they are equally pigheaded, that can be a problem too.
Females and males are somewhat different in that regard, females escalate gradually and are more concerned about hierachy, if males don't get along the objective is to drive the rival away, which doesn't work in captivity, that can escalate to a serious fight quickly. Like, in seconds.
On the other hand, my does full out attack other does of another group that invade their territory on sight.
Anyway, once they fight they will remember it, and bonding might get much more difficult, if not impossible.
Can't say much about how neutered rabbits act, but hormones have a huge impact on all that.
That's just general talk though, you don't give much information to go by.