1.

In real life, the top teams change formation more often than you would think. You can use prozone data stats to see this, by selecting average position. This is usually a subtle change - for example the full backs push forward more and the DM drops back, changing a 4132 into a 352. This takes very tactically aware players to achieve

In T11 it seems that changing your formation regularly has no negative effect, or at least leaving your players in the same formation doesn't have a very positive effect

Really, this corresponds to the way you have to play the game. In the real world, most of the first team stays with you for season after season. In T11, you are changing players all the time to get better ones once you are promoted to a new level. For obvious reasons, Nordeus will not be inclined to give you a bonus for not buying new players

2.

First off, a player has to play adjacent positions so you can't have someone who is MC/AML. I think this is a shame, because again in the real world you can be a specialist winger, so you might play as AML/R

But in answer to your question I can see no difference between a DM/ML and M/AML in the role you describe, which I have tested over the last 4 seasons. In other words it is not primary/secondary positions - if it says they can play there it doesn't matter what order the positions are listed in

3. As with the above, I've seen no discernible difference between a player with an arrow moving into a position he knows and a player who doesn't know that position - the important thing is he knows the position he is in

You can also put a player into a position he doesn't know and he might play well. Nothing I've ever seen or read on the game is clear as to what the penalties are for this. It's probably a minor possession penalty, or possibly it's factored into the game engine in another way but nobody is certain. There are many cases of teams with players all out of position, and even increasingly in 'illegal' formations, who still play well

4.

Again, nothing supports this idea. I am based in England and at one point changed a lot of player nationalities, more because I like to see players from your home country in your team than because I thought it would help performance. I didn't notice any difference. Considering that you can change the nationality easily in this way, I would hope it doesn't matter what you change it to


Hope that helps your office debates :-)