None of the players you listed are close to as good of fielder as Kepler; just what the Twins need is a lessor fielder who makes double as sure a thing as base stealing under Jeffers.
As far as fielding Simmons is still the best we ever had, but Leo Cardenas was not one only of the best we had, his years here were the best he ever performed fielding and two of his best three with a bat.