It's predicting Markakis puts up the worst BA of his career, and the second worst OBP and SLG of his career. I find that extremely unlikely.
I expect a .290/.350/.400 line from him, maybe a little more OBP and a little less SLG. And I would be shocked if he didn't hit 10-15 HRs.
I just don't understand projecting a guy to put up numbers he hasn't done in 3 years.