[Powers] Using Affliction (Skill -1) for Passive Defense?

[Jerander]

Hi,

Every once in a while someone asks how to do Passive Defense in 4e. The usual response is "All Enhanced Defenses added together." But what about using Affliction (Disadvantage, Skill -1 [-4]) instead? Would that work?

My initial thoughts are that it would need Time-Spanning, Past-Only and Reflexive. Plus it would need some way to cover *all* attack skills. Is there something about that in Power-Ups?

Any other thoughts?

Thank you,
Jerander.