Anyone who thinks Tate is an easier fight than Rousey for Holm hasn't been paying attention.
Tate is physically more powerful, has better entries into the clinch, utilizes traditional wrestling takedowns instead of Judo based ones, etc.
Its an entirely different matchup
This is true, but it's not like Holly hasn't faced those types of fighters successfully either.
The thing is Holm GREATLY benefits from 5 round fights. Her cardio is leagues above anyone else in the division, it's just on another level. I don't think any girl can get out alive after a 5 round fight. For a great example look at the Julie Werner fight. Holly dominated the whole fight, but was also very, very careful. Never overextended herself. She probably could have put her away at several times in earlier rounds, but just continued to beat her up and getting her tired until the 5th round when she finally decided to knock her out.
Holm isn't gonna be getting 14 second finishes any time soon, she'll wear her competition out and with 5 rounds to work with, I really don't think any of the other girls at the division can give her any trouble. She gets more and more effective as the fights goes on, starts to pick up on the other girl's timing and beats them with her superior cardio and strength.
I truly believe she's untouchable right now.