All good players who stack for unranked have godly winrates. I am not that good but when I stack with my 4k friends we can easily get 60% winrate consistently, if you stacked as 5 in unranked with 6k+ players not having 80%+ winrate would be awful.
http://www.dotabuff.com/players/774185
A classic example from AU servers.
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http://www.dotabuff.com/players/195347373
Where can I find his videos? And more importantly, what is his name?