TBH, Jelavic's biggest problem for me was the sheer amount of times he was offside. In this possible new formation, we will be looking to play further up the field, with the attacking wing backs. With wing backs there is a higher chance of the ball being cut-back into the box, Jelavic, or driven over for a header, Kone. Either way, it is less reliant on the striker getting beyond the man, rather find space in the box, which Jelavic has already proven to be quite adept at. That's his game, not running the channels, chasing the ball over the top. He slots, bossly. Let him slot.
Keep him.