Ran it through simcraft with different gear levels (heroic non bis, bis, current gear, ect) and simcraft does not agree with exemplar's theory. I have yet to have time to actually test it in LFR(aka fully buffed dummy) but it is not looking good. The main issue with prioritizing crit after 40% haste unbuffed is we will likely see huge swings from fight to fight, as always mastery is the more reliable choice and can be counted on to produce results.