[E. Pluribus Unum]

...it seems his disabilities would make it very unlikely he could maintain a story planted in his head.

So he's disabled enough to not be able to keep his story straight, but not too disabled to be able to build and plant bombs.

OOoookay.

[Magic Fingers]

“So he’s disabled enough to not be able to keep his story straight, but not too disabled to be able to build and plant bombs.
OOoookay.”

I don’t rule that out. Some autistic people have extreme technical skills (not that building a pipe even requires extreme technical skill, by most definitions), and it’s known that he can drive (and presumably lay a box on the ground).

But I do think it’s very unlikely that an autistic person could maintain a fabricated story, planted in their heads, under extreme scrutiny, which he’ll no doubt undergo. I don’t see those two possibilities as contradictory in the least. OOoookay?