The old adage goes that you can’t coach size, well SMU defensive line coach Calvin Thibodeaux has plenty to work with so he can work on other things this spring. That was the question coming into this offseason as the Mustangs lost three interior linemen who were key to the defense’s success in 2023. Thibodeaux and company have brought in Anthony Booker Jr., Mike Lockhart and Jonathan Jefferson to help in that area. “The guys are working hard. I love the size. I love the girth,” Thibodeaux said. “I love the fact that everybody’s, right now, just trying to learn and they’re all sticking togethe…