Nola and Jake Arrieta, who will earn $25 million in 2020 and is coming off elbow surgery, are the only locks in the rotation. One rotation spot could be reserved for Vince Velasquez, Zach Eflin, or Nick Pivetta while two other starters are acquired from a pool of free agents that is deeper than last winter’s. Cole, who could reap the largest free-agent contract in history for a pitcher, is at the top of the Phillies’ list.