On the one hand the deal is good enough for you to hit accept before he changes his mind (even without Gourde) on the other hand it may appear as though he'd be willing to negotiate a little.
These are always tricky but I would see if he'd be interested in this:
Hischier + Kaprizov + Brown + Sorokin (or dare I suggest a lesser goalie prospect?)
for
Crosby
He may or may not still want to include Gourde but it wouldn't be a deal-breaker in my opinion. Kaprizov and Sorokin will most likely be quite valuable when/if they come over but as it stands now Puljujarvi's value could explode if he gets prime minutes with McDavid. I would try and keep Puljujarvi out of the deal if it is possible.