I believe phil Spencer about xbox one sales, not these so called insiders. Also vgchartz sales has never been right concerning xbox numbers , even during xbox 360 days. They were always off every time, I believe xbox one numbers are at 38 million or above that figure. Anyways I'll always trust phil over some biased so called insider.
Well Vgchartz definitely overtracked the PS3 and undertracked 360 and never bothered to fix it. That being said Zhuge is a trustworthy insider and XBO will never outsell 360.