So 15,625 were exercised.
I think this is a typo.
While no one's hands might be clean in this, at the end of the day the party with the resources and expertise is equipped differently.
It might not hurt to get some more opinions even if they end up in the same place.
Putting aside the fact that any claims here are almost certainly time barred after 30 years, ostensibly, your attorney explained to you that because you had the grant in your possession, claiming that you reasonably relied on the company's statement about what the grant said would weigh heavily against any misrepresentation or fraud causes of action in a lawsuit.
Might as well sue.