Dr. Celestia Higano / DNDN
When I think about it, yes its possible, even probable, that the hedgies knew that 9902a would not hit the survival endpoint. Probably not Dr. Higano, but they had other ways to find out.
However, now that we know the top-line results, the unknowns (your point #3) don't trouble me too much. After all, we could guess them within 10% of their values, possibly even 5%.
The biggest unknown now however is the Regulatory Unknown. Can the hedgies ascertain that before us ?? I hope not !
Right now I think they will be skewered unless they un-wind their shorts.