If you're a Boston Red Sox fan who still hasn't heard of Driveline Baseball, allow us to fill you in. You're going to need a solid primer, because Driveline is going to be one of the key behind-the-scenes storylines for the rest of the year. The Red Sox, as you're likely well aware, fired manager Alex Cora and five of his top assistant coaches on Saturday. One of the highest-ranking coaches who wasn't let go was hitting coach John Soteropulos, who was elevated from his assistant hitting coach title under Cora. Previously, Soteropulos was a trainer at Driveline for three years. Boston has hired a number of key Driveline lieutenants under chief baseball officer Craig Breslow. Without going into a full-on deep dive, Driveline focuses on data-driven performance, with methodology aimed at improving metrics like bat speed and exit velocity for hitters and velocity, spin rate, and pitch shape for pitchers. If you like our content,  choose Sports Illustrated as a preferred source on Google .…