Hmm, I was looking at the albums that spent the most weeks in the Billboard 200 T2 this decade.
They happen to be (to date) the T3 of 2010, the T2 of 2011, and the T2 of 2012.
Though I assume this year will break that trend, as 20/20 Experience was only in the T2 for 3 weeks but it's difficult to think of 2 albums which could end up outselling it. 1, yes, - Marshall Mathers LP 2.