The point wasn't that it isn't the case because they weren't there on display, it was that there is no reason in having an additional set that just does less. For example, I put out a game system that plays one game and another system that plays the same game and a hundred others. Both cost about the same price. Makes the first system seem pretty stupid, right? Why would anyone buy that one over the second?
Ok, so for the movie 2007 line we saw Optimus Prime get a leader, voyager, legends, cyber-stomping, fast action battler, robot replicas, etc. So, following your logic (and please don't take it personal, this is just friendly discussion among people that love the same TFs figures,) there should be only one version for Optimus Prime -the leader one- since that's the one that has the more complex transformation, lights and sound, and the rest shouldn't exist because they didn't transform, or they had low detail levels, or a very easy transformation scheme. What's the point for those, right? Kids...? Nah!
But anyways, we had at least 7 different versions of Optimus Prime... and yes, he's the hero of the movie and all, but the same happened to Bumblebee, Megatron, Starscream, Ironhide and whatever other character you might think of. Hasbro has 4 different levels of transformation to help you choose which version is the right one for your child's age to play with and solve the transformation puzzle -or choose a non transforming version for very young fellas that just love the robot mode,- and heroes like Prime get to be on all levels. Right? So far we've seen two Devastator versions, and correct me if I'm wrong, but that robot will be extremely impressive for kids, teenagers and us, adult collectors, when we see the movie (it's what gives context to the figures.) Both version we've seen so far look like they don't get a 3 or 4 score points in the complexity level chart that Hasbro uses, or detail level that's up to par with deluxe, voyager or leader class.
In the end, I'm saying that no one has enough info YET to bash Devastator as a figure because no one knows for sure if the voyager and deluxe Constructicons will be able to combine. What we know is that this set costs nearly $100 bucks, and we do not know its class. If someone here can point me to a link where Hasbro says that these are the only Devastator sets that will be available, I guess I'll eat my hat... but until we see the rest of the voyager and deluxe Constructicons and proof that they do not combine, I'll keep my hopes up.
PS. By the way, I do love the Devastator design, and if this $100 version will be the only way to get Devastator, I will get it in a heartbeat. Don't hate Hasbro, hate the game.
EDIT: Regarding price differences, at least here in México, a FAB figure costs only 1 dollar less than a deluxe version and those have lesser detail and complexity levels. Cyber-stomping versions do less (do not transform) and cost remains less than 6 dollars away from voyager versions.