Why can't they just train new VAR officials? A robust training programme and list of offences which can be reviewed on VAR would ensure well trained officials.
I think you're getting at another point entirely though, which is the current rule book leaves far too much open for interpretation. It might sound mad, but I seriously think they need to provide real life examples as much as possible, and just amend and clarify the rule book. For me, if the ambiguity around rules is addressed, then the overall quality in decision making from officials in football will naturally improve.
The thing is the Premier League are going to want to protect their billion pound investment.
Clubs and managers aren't going to want "trainee's" ruling on incidents.
If anyone hasn't seen this, Carra and Neville trying to be a linesman. Watch and play along.
https://www.youtube.com/watch?v=_pGMRN5KN8MWhich is why FIFA and other bodies will use "qualified" people to be VAR officials. Someone who knows the rules, has been there on the pitch, and "understands" the game.
By understanding, and maybe this is where some may not agree, I believe the VAR will watch in real time. Not super slow motion. The VAR will need to rule on if an official made an error of judgement. So when it comes to offsides, imho, the VAR official only notify the ref if in an incident that the match official on the pitch missed something or made an egregious error. "Close" calls will always go to the match officials.
Like I said, they train together and are a team together.
It could be, as we're talking the Watford goal, the next day they go over it and the Assistant explains his call. The others go, right I can see that, and that's the end of it. Not, you dummy look at it in slow motion and you can see the offsides or interference on the keeper. The Assistant doesn't get 3-4-5 replays to make the call. The VAR can look at multiple angles and slow things down. If it comes to over ruling the match official due to slow motion, then the game will move to having no Assistants. Only a Ref to blow up and give out cards. And at that point, it ceases to be football at least for me.