Holly Holm is a former boxer, so I feel compelled to root for her to beat Rousey with a boxer's temperament. What I am referring to is her patience, lateral movement, etc. She's learned MMA pretty fast and does well, so I think she can utilize her strikes, kicks, ground game, but with a similar approach that she had in boxing.
UFC is going to try so hard to push Holm as the boxer and the biggest threat to Rhonda when Holm cant even punch.
She was a good boxer because she could move around the ring and fight the sweet science. She has barely any KO's and in her last UFC fight she was rocked hard.