It's not exactly Mastermind. It's no more a quiz than VAR is only for clear and obvious errors. As there is a ? after each incident, I went with "quiz" at the start, then had to stick to it.
All incidents recorded were not hypothetical, they all happened, and would all be liable to be reviewed by a VAR. Most had clear and obvious solutions, some were subjective, and a handful of decisions would be allowed to stand, as is the case with VAR atm.
Some of the subjective answers are hypothetical, because they have to be. We can't make them factual, as the clubs refused to use the resources available. Even professional refs can't agree on certain decisions. It doesn't mean the wrong decision was made, it does mean it can go either way, but a decision still has to be made.
Regardless whether Tierney specifically is making decisions or not, as he will sometimes, VAR has a 99.3% accuracy rate. It's as close to waterproof as we can get. Therefore the amount of ref errors in the league will be drastically reduced from now on. Even Tierney will get them right.
Many other sports have used technology for 2 to 3 decades, longer in some cases. It's now 2019. It's about time we caught up with what other leagues, let alone other sports, have available as routine.