"Unrolled" fuselage is not relevant, since the aircraft at cruise altitude(inflated state) behaves as a punctured balloon.
Nope - There are way too many crackstoppers-stringers, frames ( circumferentials ) involved to act like a puncture ballon.
The "tear line" construction of the aircraft cannot confine large structural failures due fatigue or explosion. Actually the point is that "unrolled" fuselage is not relevant", it doesn't rule in or out the decompression vs the explosion.
Compare the two pictures below:
http://static.apple.nextmedia.com/im...int/26c1p6.jpg
https://upload.wikimedia.org/wikiped...nstruction.jpg