when the fight between rousey and davis ends up on the mat, it's only a matter of time before rousey armbars davis. tate had the advantage and experience of fighting rousey twice and the outcome was the same: tate got armbarred on both occasions. it shows how effective rousey is in applying the armbar when taken into consideration that tate had the experience and opportunity to practice and train against the armbar.
davis may say and think she can defend against rousey's armbar, but the reality is she is only fooling herself (similar to what tate said when tate proclaimed that she would shoot herself in the face if she got armbarred again by rousey prior to ufc 168).
davis would give herself the best chance in winning the fight against rousey by keeping the fight standing up and avoiding the clinch with rousey. jab, punch, avoid the takedown, and move. davis should gameplan the fight like gustafsson did when he fought jones. this would give davis the best shot at winning the fight against rousey.