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If "Saunders version 3.0" survives major-league pitching (he had a hit this morning) and gives you another LH OBP bat . . . then demote Jaso when Guti is back and I won't object.
At that point Saunders (or Guti) becomes the 4th OF, and it's between Wells and Jaso for the last spot. Saunders and Seager would already have reserve roles, and it makes sense to keep one RH basher on the bench. (I like Wells as a role player, not as an everyday guy.)
OTOH, if Saunders is going down upon Guti's return, then I would keep Jaso.