Ann: Change of Director's Interest Notice , page-7

I would not worry to much about the cross trade. David Munns is similar to Dennis and most of the GGX team.
They prefer to choose shares than get paid ridiculous salaries. Sooner or later they will have to sell some to make a living.
These guys deserve more, but they are concerned about the cashflow of the business. So hence opt to choose shares instead.

Who did he cross trade with? Who know and who cares. Probably indirectly back to himself or someone else within the GGX team.
This is not uncommon.
I have done a similar thing a few times before for various personal or strategic reasons. I could cross trade/sell my shares today to one of my businesses for 1c if I wanted to. Does that mean the shares are worth 1c? Of course not. It is nothing to worry about.
Cross trades are just that and don't represent any true SP value.