Directors Buying

I was watching another company s/p and noticed that after a 3Y notice (change of director's interest) the price move seemed to be quite positive. So I Iooked at AML, and Hamish Collins is the only director who has put his hand in his pocket since March 2018 and bought shares on market.
I'm aware of blackout periods etc. but I guess that the directors haven't thought "the stock is cheap" and actually bought some. Just saying...