Video you linked I have hard time categorizing what is going on to cause males to be moving about. Some where obviously immature. At least a couple where mature and replacing tail feathers. Dependent offspring ranged from chicks less than a week old to what appeared to be 4 to 5 weeks post-hatch.A video where the males forage together? There's quite a few of those videos in youtube. The males foraging could mean one of many things: they are subdominant males during the breeding season that decide to stick together since they can't obtain harems, they are young of the year birds in the fall and winter, or that the breeding season is over and there's no need to compete over hens.