Springer had almost double Walker's minor league BB rate (12.5% vs 6.9%). Despite some similarities in K% and ISO, I think Springer was a very different type of hitter. (And player overall -- Springer also stole bases at over 4x the rate of Walker, with a better success rate, and played CF throughout his minor league career. By my estimate, Springer also tops Walker in career MILB wRC+ 155 to 124.) Steven Moya might be an interesting current comp? Walker's minor league offensive performance to date is actually not unlike Arcia's MLB offensive performance to date. Similar BB%, K%, BABIP, AVG/OBP, although generally much more SLG/ISO. It will be interesting to see how that translates to AAA and MLB -- if it can hold, with solid defense, he could be a useful piece.