Fletcher absolutely dominated the Bills yesterday and was the difference in the game. Solomon Wilcotts called him the best DL not named JJ Watt and it's hard to disagree.
The article has comments from Incognito and Rex Ryan verifying comparisons to Jerome Brown

http://www.nj.com/eagles/index.ssf/2015/12/rex_ryan_compares_eagles_fletcher_cox_to_jerome_br .html