Looking at the background, the rights are intended as partial...

Looking at the background, the rights are intended as partial compensation for various things such as additional roles, time spent on organising a clinical trial by Dr Currie and in the case of Mr Mutton, a voluntary reduction in fees/salary.

Overall it increases the skin in the game for the directors. The more the company prospers and the share price increases, the better off they are. Its a small cap stock which is still not profitable, so its not a given that they will get rich on the shares.