By Justin Barrasso Roman Reigns’s reduced schedule and CM Punk’s injury raise questions about two of wrestling’s top champions ahead of what is usually one of the sport’s most exciting times of year. SI.com’s Week in Wrestling is published every week and provides beneath-the-surface coverage of the business of pro wrestling. A tale of two championsRoman Reigns and CM Punk are the world champions, respectively, of WWE and AEW. And each has an important task in his immediate future this summer, though their situations are entirely different. Let’s begin with Reigns, who holds both the WWE and un…