I was thinking the same thing for a while, but Smith makes a better 3-4 DE than a 4-3 DE due to his size and solid play against the run. 3-4 DEs are not expected to be great pass rushers. There are no true reasonably price 3-4 DE upgrades on the FA market. I see Chris Canty as a good 3-4 DE signing on par with Smith if Smith doesn't accept a pay cut.