I'm still on the fence about whether susano'o is absorbable or not, but people saying that he could absorb shinra tensei or edo tensei or any other ninjutsu that is not a physical attack is wrong. How do you absorb gravity manipulation...? And as for mokuton, i like to think about it this way. Sasuke's kusunagi infused with chidori against preta path. Preta path absorbs the lightning, sure, but there's still a f**king sword coming at him. That's what i believe absorbing mokuton is related to. (This is not really a response to you, blaze, i just needed someone to quote and you had the databook.)
I actually somewhat believe an edo tensei could be absorbed by preta path, as technically their entire body is a ninjutsu...