The assistant takes part of training. His job is not to motivate players, thats where the manager comes in. So nicky butt or anyone would make a good assistant as long as they are knowledgeable about the game and have good interpersonal skills.
Hypotheticals yes, guessings, well everything is speculation. I dont know what you are talking about weird scenarios. It is pretty simple. van Gaal has a huge ego. he falls out with players. Now i am suggesting that if a player falls out with him and giggs sides with that player maybe not publicly, then you have a serious problem.
One of the reasons moyes faltered is that he lost the support of key people in the club from early on. Ferdinand was tweeting, G neville and David may were on tv, as was scholes. RVP didnt like the training. Danny welbeck threatens to quit. All this leads to a manager who isnt respected, the morale is low and the team suffers
When ferguson was in charge this rarely happened and when it did, it was dealt with swiftly.
Now i am entitled to my opinion as much as you are to yours, so please dont insult my post by saying it is weird. What i am suggesting happens in clubs all across the world. Disagreements happen in football and many of them happened under ferguson and he was ruthless in getting rid of them.
I would have preferred kluvert to come in because he would unconditionally back van gaal regardless of what happened.