I'm not quite following the initial part of the post. Unless I'm missing something, DPM in the UAE is a title that, in the 21st century there, has been conferred on people who are influential members of the Cabinet, either upon their appointment to their Cabinet role or later.
The four (not three) current incumbents are respectively President of the Presidential Court (Mansour), Minister of the Interior, Minister of Finance and Minister of Defence. They're all members of the Cabinet, and those roles arguably earned them the title DPM. Mansour has been in the Cabinet 5 years longer than he's held the DPM role. I don't see how one can mount a credible argument that he's not a member of the UAE government in those circumstances. Anyway, just a throwaway point. I don't really give a toss about that.
As far as what PwC's thought process was, here goes. The argument rested around the wording in IAS 24 that was copied over into UEFA's FFP rules as Appendix 10, applying to City's case in 2014. I don't have time to find the exact quotation, but it doesn't just cover influence achieved by common familial and business connections. There's also a catch-all wording about otherwise having an opportunity to exercise influence achieved otherwise and this is what PwC seized on, with their main evidence being the Etisalat sponsorship.
IIRC, they believed (I forget on what basis) that City had procured an increase in the Etisalat contract to take it above market value in the year that Mancini and his staff were dismissed. This was allegedly done with a view to keeping our losses for that year below a threshold figure where a sanction would have been triggered had we exceeded it. City had hoped at the time to avoid a sanction for the first FFP reporting period by deducting GBP 80 million or so of pre-2010 wages.
IIRC, PwC argued: (i) the above showed that City had the opportunity to influence Etisalat because it was impossible to contemplate that an arm's-length sponsor would agree to amend a contract that still had time to run so that it would pay more for the services received; (ii) that one could credibly infer that an Abu Dhabi publicly owned company had thus been influenced owing to the positions of Mansour, Khaldoon and Pearce in that Emirate; and (iii) if City had the opportunity to influence Etisalat on this basis, the same would apply to other AD sponsors.
NB - The above is from memory. If anyone ahs the time and inclination to go back and dig through it all (both in terms of the wording of IAS 24 and of PwC's arguments, please do. In the discussion below, meanwhile, I defer to accountants who know more about IAS 24 than I do.
However, I have been involved in various tax cases where there were related party issues. In other words, a tax authority relied on a statutory right to adjust the value of a related party transaction (RPT) that wasn't at fair market value and resulted in less tax being paid than should have been. My recollection is that it's necessary to demonstrate, for a transaction to qualify as an RPT, that not only does the opportunity to exist, but the fact of influence being exercised on more than just a one-off basis must also be present.
PwC's argument seemed weak to me in this event, as it appeared to be based on what in effect was a one-off request for a favour from mates being viewed as ongoing influence. City, I suspect, believed that PwC had prized supplying an analysis that would be palatable to their client, UEFA, over one in which the rules were outlined and applied properly and Cliff's comments suggest the club was prepared to litigate. Ultimately, UEFA didn't push the point and the settlement agreement treated the AD sponsors as non-related.
One more quick point. I saw @slbsn criticised on here last night for misrepresenting the seriousness of the case against City. Seems to be way back in the thread, where it much better placed, but such arrant nonsense really deserves to disappear altogether. Stefan is the Lord Pannick of the commentators on this thread (and elsewhere, too). The rest of us are mere hapless juniors with the odd valuable contribution to make but otherwise floundering slightly as we try to keep up.