Nope. He held 4,040,000 (40k of which were held for his son),...

Nope. He held 4,040,000 (40k of which were held for his son), now he holds 2,040,000 (40k of which are held for his son).

He sold 2 mil of his own.

Yes he holds a lot more through trusts etc, and sure, there probably is a reasonable explanation (could be any reason really), but given the lack of any detail it feel more like an opportunistic sale than a reluctant sale. 

Make of it what you will. If it was opportunistic he did leave $600k on the table!