The biggest concern is that Tarrant, Riewoldt, Cotchin and possibly Grimes are all at, or near, the end of their careers. We may end up using the mid season draft to replace one of them next year.
I would look at a like for like replacement for each of them now. It will probably unbalance our list slightly because we will go into the season with too many talls but it seemed prudent to start blooding their replacements ASAP.
Jack, Cotch and Grimes are all generational players and will not be easy to replace. We will need several irons in the fire to do it successfully.