In K'Lun omegas are rare and are trained alongside alphas. In order to prove themselves worthy of an omega they have an interest in, the alpha must defeat that omega in a fight. When the other three defenders defeat Danny in their fight, they have no idea that, in Danny's eyes, they became his alphas and it's a bond that Danny takes very seriously. It takes time and some injuries but eventually the other three also accept the change in their dynamics.