Aldo's doesn't seem like a guy who would lose a UD. Maybe you catch him, but the idea that you go five rounds with him inflicting more damage just doesn't seem realistic. Take the Hominick fight. Sure, it went five rounds and Aldo even lost the 5th, but he had messed Hominick up so much that it really could have been stopped. Same with Faber. After Aldo had him in that crucifix for over 90 secs without the ref stepping in, Aldo just blew off the 5th. The Florian fight was different; Aldo was never in position to finish Kenny. But Aldo was also never in trouble. I think it's fair to say all three also had similar strategies as Edgar has proposed. Keeping up the pace and pressure. Competing with Aldo in striking.
Now consider Edgar. He went five rounds with Henderson twice and I don't think he left a scratch in 10 rounds. He tagged Henderson, even dropped him at least twice I recall, and also scored a few TD's. But never did any damage. Frankie can't take Aldo's belt going five rounds without any evidence that a fight happened.