I can understand the desire to have a CC right away, I'd like to see one ASAP too.
But if we believe Dr. Stoll that the FDA letter hasn't arrived yet, then it simply hasn't arrived.
And it makes 100% sense to me that Cortex should thoroughly review it before making any firm decisions. Cortex needs to understand precisely why the FDA shot down CX717, and use that knowledge for future strategic planning as it's quite likely Cortex will have factor the DPP vs DNP into Cortex's strategy. DPP vs. DNP probably also affects the type partnerships that are realistic now post-IND decision.
I would also assume that Cortex will want to review the letter with their former FDA consultants - that takes time, especially when the letter hasn't even arrived yet.
Another factor not being given consideration is that phone calls are probably being made back and forth right now between Cortex and BPs and maybe other players as well (another small biotech, finaciers, etc...) that take time to evaluate.
The IND rejection radically changed the landscape for Cortex, and while I hope and expect that as much contingency planning as was possible was done ahead of time, it's still the case that a lot of dynamic events were kicked off by the IND rejection, and Cortex has to sort through those now. That takes time, especially to do it right.
Lastly, the decision on the future course of Cortex is a critical one. Personally I want it to be a well researched and considered decision, and I'm more than happy to allow the company the extra time to be confident in their decision.