"I can tell you what happens if you leave a pylon fuse pin ( shear bolt ) out after a pylon drop. Ten landings later, the remaining fuse pins fail,and the front end of the pylon/engine pivots forward around the aft attach to contact the runway in a shower of sparks and debris. Thankfully it happened on the runway in reverse and not moments earlier on short final."
They left a lot more out than a single fuse pin on that incident and it did survive several flights until it got a bad jolt on the ground.