You don't know much about striking then. It isn't about power in a lot of cases, but accuracy/where the punch lands. Cyborg hurts girls even when she doesn't land flush right behind the back of the ear as it appeared Ronda did to an overwhelmed (and possibly hurt to the body, from what I saw) and retreating Correia. Any one of the strikes Rousey landed earlier in the fight would have put Beche down earlier in the fight if Cyborg landed them. Beche is a small girl. She's got a small frame even for a BW and Cyborg is a massive FW. Cyborg would hurt her with the air off of her punches, almost.
Small frame? Are you sure you're not talking about everyone of Cyborgs recent opponents.