I dont get the BPA

i used to be a bpa guy all the way (i guess i still sorta am) but the new atl gm, who was head of scouting for the pats, seemed to imply that the pats drafted need first (or at least system first)... i know the colts draft system first, but those teams have longstanding systems on O and D in place so their scouts look for the best players in needed areas who fit their systems ... maybe that's the way to go, once we actually settle on a system :)