My experience is that 99/100 matches there is at least one red bar player.
Also from my experience i can say that one of those red bars is the host.
And the host has red bar, because everybody is playing on his connection.
Probably he has a very good ping, but too poor bandwidth for all players to play on. That's why red bars are mostly MVP's- they are hosting, so nr. 1 connection which counts.
This is the reason that after 2 years there are still red bars, every match......Bungie won't ban them, because they know it's P2P's matchmaking-system's fault.
Everybody knows that when you have very bad internet (red bar), you can't make a kill. Have tried it myself.
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I played a match the other day and finally got fed up with a guy on the other team that was teleporting all over the place, not taking damage from supers, etc. Of course he was the top player. I never send messages, I just report but like I said; I was fed up. So, I tell the guy "You're either cheating or playing on a really bad connection, so I reported you for both". He responds:"Sorry, bad weather here". At first I'm thinking "oh my bad". Then I realize "F-CK this guy". He's either full of shit, or he knows he's playing on a shitty connection and doesn't care. Pissed me off.