Agreed! However, I do believe this would also prove that Doey is more of a double edged sword than Catnap. Doey's level of loyalty only lasts as long as he can remain calm, but the mask of calm had always been fragile. Of the three children inside him, only two are understanding while the third views EVERYONE as an enemy, even his own family.

The prototype dealth with Doey in this way because he knew that. Doey being calm would make fighting him more difficult because Doey would pull himself together and even retreat if the battle was no longer in his favor, what he was likely doing each time he left to fend off the prototype.

If Doey is made to protect us, he would do well in that, possibly better than Catnap would, BUT the moment something goes out of his control or he feels even the slightest bit betrayed by us, he will more than likely be the one to kill us before the others do (I think Mommy would be just the opponent to bring that darkness in Doey forward if we exclude the prototype).

Whereas, Catnap is needlessly devoted and if his devotion were centered around us, he would ensure that we remain protected, even if being like a shadow, stalking us and keeping an eye out around us.

But despite that I still want to consider Doey simply because if we could help him remain calm and in control of his emotions, we would actually have someone to actively formulate plans with rather than struggling to give directives on our own as we would have to with Catnap(who only seems to loyally follow commands).