I believe shares purchased on market are bought by Morrison and Co and then distributed to the directors as part of their remunerations packages. So maybe checking for individual director holdings will yield a more conclusive result.
Regarding your second question, Infratil is one of many "products" if you will that Morrison and Co offer. Each product offering hosts different criteria based on risk and ROI hurdles. That's why you have Morrison and Co. purchasing Telstra towers, but then have Infratil offloading Vodafone's. I believe I remember reading on either The Australian of Financial Review that Uniti failed to meet the ROI hurdle set by Infratil hence why we didn't partake. Infratil also has it's own board of directors that sits underneath Morrison and Co. Back when AusSuper lobbed the takeover proposal, it was Infratil's board of directors who assessed its merits, or more specifically, the independent directors.
On another note, finally took some more today. Had been waiting to spend the funds and ex-div provided, my largest holding too
@risso 
Cheers,
Dalto24
(20min delay)