Which would suck...Hoshino-sensei killed Cross? So soon? ...and everyone else... ._.
So it wouldn't hurt adding another forbidden theme xD No, honestly, Allen becoming a Noah, even if it's only thanks to receiving Noah-power sorta forces him to go, unless he wants to die. I mean Allen was already almost tried for heresy only for maybe-using Noah-power. BECOMINg one might mean his certain death.
Cross and Bak and Cloud and Reever and Tiedoll and Miranda and some other guys no one cares about as much... xD
The Inspector implied that the Order would "use" a Noah in their possession somehow... this was after mentioning Allen would be tried for heresy. Since Allen wouldn't be aware of his eventual fate (torture and death), I don't see why he wouldn't want to help the Order... unless Noah's memories make him feel otherwise... and then I think he'd probably hang around for a few days/weeks, worrying about what to do. Whether he ends up leaving or the Order finds out and "captures" him first, though...
If you put Cross, Bak, Miranda, Reever, Cloud, Tiedoll, and so on and so forth along the line with the ones no-one cares for I'd protest...well, I do. Despite Tiedoll and Bookman + the ones we don't know of...and maybe Johnny the others are very cared for. And I think Renée is cool....somehow.
If the Order really wants to risk and keep a Noah for use...then this point goes to you. But since that heresy-sentence the Order strikes me as very, very, very cautious, and reacting like erasing every mark that might dirty the oh-so-pure reputation of the God-warriors' Order.
I thought that woman survived, actually (she was on the stairs) - we saw the floor crumbling towards her, but did it actually get to her?
The Inspector did imply that the Order would "use" a Noah (in chapter 137, I think), and Allen would be a fairly safe bet. He's already proven that he has loyalty to the Order, and if he acts against them at any point, well, I'm sure a trial and execution could be set up immediately.
Fact is that she isn't there anymore. If she was she'd have been killed because the Akuma passed the stairs (or the stairs was in his view) and went killing the Skulls.
I actually wonder whether Allen would like to stay or would grab Lenalee to flee, when he realizes that he's at such a point really only a tool, actually a prison and such...
Maybe the level 4 ignored her. She wasn't really in its way, and didn't seem to be important (it went straight for Komui after seeing the Rose Cross, for example).
If Allen ever realized that he was being used and the Order was planning to kill him eventually... he'd probably run off on his own and be caught by Lenalee, who would then want to leave with him.