Looks like it was written by a lawyer, haha.
One example to consider about individual vs group or line rating (central question 2) - Some have shown that a limited number of low Q players can perform well with an otherwise good team, like the 1 star goalie. Also there are games when the opposing defense shows its highest rating on the lowest Q defender. This could mean the defense as a whole is playing poorly, but that's still a good showing for the low Q player.