I'm not really sure what you mean by "willfully disappear," since they didn't seem to do that earlier in the movie either. Its not like they could walk through walls or shunt themselves into another dimension. They could compel someone to look away at just the right time ("Look, a noise out the window!") but that only goes so far, and is really more a momentary distraction, affording them just long enough to duck out the door.
As for bringing the one boy back to life... my assumption is that this largely relied on their telepathic abilities. It was also clear it took then some time to get things to the point that they could resurrect him, since, after all, they kept his body around for awhile, even though that lady at one point was telling them that keeping his body around and protected was kind of pointless and they should just let him go.
I'm guessing they first did something to repair the damage done to his body when the soldiers shot him dead, this could perhaps have been done with some bodged-together apparatus (in the same way they bodged together that sound-weapon out of scrounged parts and that church organ), but it could also have been done simply with them, over a period of several hours, telepathically willing his body to repair itself, by them projecting strong impulses into the part of the body that was damaged, making the cells knit back together in there. Or it could have been a combination of the two. And then when that was far enough along, they telepathically reached into his brain and JOLTED him alive again.
BUT, since this relied on their telepathic nature, and was probably only possible with several of them working together on it, all of the means that were used to bring him back to life... died with them later when they were all blown to bits.
So, no, not a chance of bringing them back. Not unless one or more of them didn't quite die in the explosion, and that seems rather unlikely.
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