Reasons:
Injuries are piling up at DE (JJ, Djax, Rousseau).
Can't count on Djax and Patchan to stay healthy.
Bethel at DE provides help in stopping the run, keeping Garvin and JJ fresher.
Willis, Silvera, Ford, Tito, Miller, Martin can hold it down at DT.
Bethel isn't some plodder who can't...