It comes with the territory of asking a certain kind of question. E.G. this very round: how do you prove a negative? We make the conscious decision to have such criteria to mix it up rather than repeat the same number of goals, red cards, played for opposite sides in a final, etc. to death. It's a fifth sheep draft, would get boring and repetitive if we always go for the same formulas.
Ronaldo: it's an absolutely unique grey area between same squad and playing together in the same game. It's "only played for the same side in one game, just happened not to be on the pitch at the same time". You don't design for that, it's what you call an outlier/exceptional case. EAP asked and GS ruled OK. If any of you had asked it might have been you. Lesson: ASK.
Lizarazu: we asked for any link simply because webpages can be outdated. I've seen several married players portrayed as dating and their wives as girlfriends (or partners when they have kids but aren't married). Why? The news item is probably from before getting married. I can't hold it against a manager if he finds a reference that they are married and goes with that as validation. I sure don't suspect foul play as if I enter "Lizarazu wife" on Google my fourth hit says "Bixente Lizarazu and his wife...". I'd stop there and move on. If any of you saw that you could have asked or highlighted it. In fact, one manager did warn us another Frenchman was NOT married as he had seen different accounts. It's joint policing basically, we are not going to scour the gossip pages to find if X is on the market or not.
This round: as mentioned, some players may have been called up and unused on the bench in some random friendly or qualifier without anyone noticing or having a simple/watertight way to check it. The obvious checks will be made, but there may well be cases that slip through, e.g. ADS is known to have switched sides and play for Barca in a friendly, others probably have and we won't have a clue about it, nor can we expect managers to unless alerted.
Again, self-policing. If you spot something that looks like a grey area don't wait until the end to cry wolf, just bring it up so we either rule on it or keep it in mind. If we PASS someone that's that, particularly when Tuppet passed in T2 and would have been entitled to a third attempt.