I wouldn't call any of them booted. According to the ARBA SOP, a "booted broken" refers to a broken that is colored everywhere except for white appearing below the elbow on the front feet or below the ankle on the hind feet. I could see someone arguing that the two bucks are too heavily marked for show purposes; they're on the borderline of a discretionary call, but I wouldn't have a problem with them. I think Eng Lops actually look nice with a heavier broken pattern, since it tends to accentuate their mandolin shape.
UPDATE: The pattern preference for broken Eng Lops is a little different from other breeds. The blanket pattern is preferred and heavy coloring is desired. The color is to start on the shoulders and continue in a sweep to the lower hindquarters, with the legs and feet being white. So both bucks looks pretty good in that department, but again, color and markings count for a tiny amount (4 points altogether).
The senior buck looks pretty good, with good depth, correct peak (as far as I can tell, as he's a bit overposed) and what appears to be a good solid shoulder. His ears are folded which makes me wonder about their substance, but their length looks good. The distribution of black and orange in his pattern could be more balanced, but that won't account for too many points. Without getting my hands on him to judge body condition and the substance of the ear, I like the look of that junior too. But the doe looks a little pot-bellied, high in the shoulder and lacking depth over the hindquarters. I'd look further for a better doe if it was me.
Breeding brokens together is frowned on because of the megacolon issue you mentioned, and also because charlies do not compete well, being faulted or DQd for having too little color. If you're willing to accept both consequences, breeding brokens is okay. Blanc de Hotot, Dwarf Hotot and Dwarf Papillon breeders do it all the time. One nice thing about charlies (besides being cute!), is that if you want to produce broken colored rabbits, using a charlie for breeding guarantees the whole litter will be broken colored.
