Upgrade season is upon us! For all supercoachers chasing the overall prize the time has come to begin the upgrade downgrade cycle. To help with that Bill and Liam talk about which rookies are ripe for the cull, which rookies to trade in and which premos you should be chasing. They also talk about Liam's 1,100 rank team and how he intends to make a move up the order. Captain choices, rookie field picks and more in this weeks Science of Footy podcast.