Actually, it makes the injection process easier and doesn't open up holes across the grain. Yeah, you can get pockets and that's one reason you need to do the injection early and let the meat rest - the injection will have time to disperse more evenly. No matter what you do there is probably going to be some leakage.
Southern Brethren BBQ Competition Team
"It's all about getting paid!" - Myron Mixon
"I love being hated in my hometown!" - David Hair
KingFisher Gator Rotisserie cooker, WSM, Stainless 5 burner with IR gas grill, Turkey Fryer, Weber JD Commemorative grill, slightly used Bandera chamber for future use as a cold smoker, Masterbuilt 40" insulated ELECTRIC smoker