Welfare's estimates are shipped and not sell-through. He has Xbox One shipment estimates at ~22.1M (December 2015), while our sell-through estimates for Xbox One are at 19.23M for a difference on 2.87M.
VGChartz Sales Analyst and Writer - William D'Angelo - I stream on Twitch and have my own YouTube. Follow me on Twitter, Bluesky, and Threads.
I post and adjust the VGChartz hardware estimates, with help from Machina.
Writer of the Sales Comparison | Monthly Hardware Breakdown | Monthly Sales Analysis | Marketshare Features, as well as daily news on the Video Game Industry.