This is interesting new statistic. While would be great if I could see somewhere which 5 players played together and maked best +/- during that time.
Like a group +/- rating or something. Thanks to this I could check during which tactic they were so effective. While this depends pretty much on the opponent, might be interesting to see which players were setted against them for that time and for how long.
This might be only for 5 players which were longest time in the field, which seems always like starting five, but thats not usually true and these players usually get some + or - with bench player, so is quite impossible to see how they really work together.