Undertaker.: My point of disagreement was about the examples : I woudn't like to play a game with a BKR 2200 and a BKR 1600, however my position may be : 2200 or 1600.
But, I must admit I hadn't thought to the " terrible " example you mentioned : " In past, I remember I was the player with best BKR of my team and the weakest opponent player had a BKR more high than me ".
This confirms my idea : a team with several and different BKR and no possibility to play when the difference in ratings between 2 players is too big.
But this is also a little restrictive.