The only reason I don't see anything other than Transformers replacing Monsters is because it's a proven brand with huge in park buzz right now. Not to mention ask 100 people between the ages of 12 and 35 what Energon is and I'd say most of them would instantly affiliate the word with Transformers or at least much more so than any other movie tie ins. Then the easier it is for the consumer to identify or relate to the movie item the better chances of selling the said item to passing guests at 7 bucks a piece.
Think about it this way, you come back from a vacation at Universal and your telling a group of friends about your trip with enthusiasm.
Option 1 Random Slushy
Transformers the Ride was amazing, easily the best ride there! After the ride the entire family got our picture taken with Optimus Prime and Megatron. Guys these things were unbelievable, easily like 10ft tall and they moved around and talked to you. There isn't anything like them and my kids were just loving all of it. While they finishing getting pictures I grabbed this orange slushy and a brownie thing from the restaurant close bye, it was really good. You guys gotta go!
Friends reply
Oh man that sounds amazing, can't wait to go!
Option 2
Transformers the Ride was amazing, easily the best ride there! After the ride the entire family got our picture taken with Optimus Prime and Megatron. Guys these things were unbelievable, easily like 10ft tall and they moved around and talked to you. There isn't anything like them and my kids were just loving all of it. While they were finishing getting pictures I grabbed Energon it's like a Slushy and a Cube which was a brownie. It was awesome!
Friends Response
Oh man that sounds amazing I can't wait to go, I'll have to try that Energon.
Granted this is all speculation and everyone is different but I think most can at least see the point I'm trying to make about association with a known brand vs random stuff.