It’s simple.

Either you believe Nader sold for the purpose of cashing. Then he has lost confidence and it might be the perfect time to lose confidence to and sell your position.

Or you believe Nader sold having private money ready to support Cydy financially if needed. It’s an act of faith. Nader doesn’t want any further unneeded dilution. He believes in the company and thought this was the best way to “guarantee” it’s further existence. You should hold or add.

Nothing can be proved. It’s just what you (wish to) believe.