We're lucky to have On Piety, but Obbink's reconstruction of the text is speculative at best in some areas of the papyrus. Even the parts of the papyrus that are more complete often provide citations without much context. Obbink et al are more than happy to provide commentary, but much of that appears speculative. However, all that said, I need to dig deeper into Obbink's translation and commentary. One paragraph that caught my eye this morning was:
Fascinating stuff!