What's weird is that Hoshino seemed to go against everything she's been implying for chapters.
It DID seem as if Mana was going to be the 14th, and while Mana being his brother is better than Mana being a random minion/friend, it still feels a bit weird. Now we really have nothing on the 14th, despite knowing that he apparently was connected to Allen somehow (but how? Wouldn't Allen know if he met the 14th, and if not, why would people like the Earl know he was connected at all unless the guy resembled Allen so closely it's not coincidental?) and possibly even met him. Things would have made sense if it was Mana, but now, we're left with even more questions, I think. That part's more okay, though.
But Allen? At first, Hoshino seemed to imply that he really was a Noah (a normal one) with the shadow, then seemed to change her mind and make it a separate entity - as if Allen was a normal human with the Noah powers. What about that image from 165 where he has one black wing? Yet now it seems he's the original 14th, which somehow turns all that on its head because he's a full Noah - but it isn't Allen, it's some other guy. Where did that come from?
And most of all, what the HELL happened to that "human controller" bit? Considering that the 14th apparently stuck his memories into Allen, not the power to control the Ark, that stuff feels irrelevant and confusing. It's like Hoshino forgot all about it, or set it up to make us think one thing so she could surprise us with a plot twist. Most people probably forgot all about it, but it's much harder to see how that makes sense the way things are now.
Of course, then there's the flashback. Gee thanks, Allen, you spent seven years being kicked around in a circus and never felt it was worth mentioning? Again, was Hoshino just playing around so we could think up ridiculous theories? It looked more as if Allen didn't remember AT ALL (or he could've had a really boring life), but one would think that such an abusive and shitty past would have been mentioned before now - at least in the fanbook, if nothing else. And why DID Mana pick him up? Coincidence/fate? Kid looked like his deceased younger brother? What the hell? I'm sure Hoshino could have thought of something way better, and it feels like this part of the story will either stay full of holes or Hoshino will have some boring explanation. It's like a disappointing resolution to a foreshadowed event in The Wheel of Time (epic book series) - if you set something up to be exciting, you'd better make it exciting or else you'll annoy a lot of fans who were waiting for something way more awesome.
Most of all: Either Mana was the 14th, or Allen is - that was how it should have been (both would have been too awesome for this series). Now it looks like neither, since Allen just has the 14th stuck in him according to what most fans seem to believe. If Allen spontaneously turns into a Noah and is still Allen, GREAT! There's hope, but sadly, I'm not too confident that'll happen anymore.