Not sure if US would beat 7ives because of the patience factor needed to beat them. Don't see why your trying to compare sparrers from two different eras. But anyone who is unbiased towards US/Alumni and played actively from 2010-now will tell you that the Golden Age of spar on iclassic was 2011-2013, due to the better latency and the activity in the spar community, and due to the skill based leaderboards rather than the quantity based leaderboard we have now.
I don't really understand how people can take spar competitiveness so seriously in 2017 when its the same 200 people since 2014 and nobody new has appeared