Acquiring shares in the public market or exercising options is not "the same thing" at all. Marelli exercised his options at $0.61 , what do you think he had to pay if he would've bought the shares in the public market?
You said: "Exercising options really isn't a good thing (or a bad thing)" and that "It's really a neutral move".
Of course it's a "good thing" and it's not a "neutral move"; Probe gets its money and the Insider will make money as well. By exercising his options he shows his faith in the company, All good, right?!