Ascent in Südwand

Rarely repeated: last entry in summit register from 6 years ago. Nice parts (especially pitch 4), but also crumbly sections at pitch 1, 3 (!) and 5 (!!). The flake at the beginning of pitch 5 can only be reached via crumbly rock and sketchy pro. The bolt below it seems to sit in a hollow rock slab, which might collapse when loaded, sending the flake down like a Guillotine on climber an belayer - very scary. Not sure if it can be bypassed.