Ok, they are rogers customers.. Hmm..
Are they in the same basic geographic location? (city, etc) or fairly different.
I know my paths, even through rogers servers, are different than say someone who is in toronto, etc
(i am like an hour north of toronto)
If we KNEW what server the xbox tested against.. could to a tracetroute and pathping from both households and see if any varriences.
(wish you could do those FROM the xbox)
The xbox data should NOT be P2P though.. P2P data throttling, was targeting specifically TORRENT data type packets.. which xbox shouldnt be using that i am aware of.