Vernon Wells, as stated in that other thread. Hes at or near the top of all the important counting stats for hitters as a Jay, ahead of guys that are already up there. He is second all-time for the Blue Jays in career hits, doubles, runs, RBI and total bases, and fourth in home runs.
He was a huge fan favorite while he was here, and despite underperforming after signing the big contract, he did bounce back and put up nearly 4 fWAR in his final season as a Jay before AA managed to deal him to the Angels. 3 Gold Gloves, 1 silver Slugger. 3 time All Star as a Jay.