The injury is serious. It’s at least a torn ACL with reports suggesting there might be more serious damage as well. Secondary to Foster’s wellbeing is the damage done to the Redskins defense. Here’s the analysis of that:
Foster raised the ceiling of the Redskins defense. He was a potential playmaker on a defense whose best players are more the “unbelievably solid” type. He was a sideline-to-sideline linebacker who Washington hoped would be able to come down hill and be a force at and behind the line of scrimmage. He was someone they hoped would force fumbles and deflect passes. He was someone they would have blitzed, and would have gotten home unlike the linebackers of years past who have been perpetually stuck on “oh so close.”
The Redskins were hoping that a fresh start would help solve all of Foster’s ills. Instead, he faces an incredibly grueling surgery and will be pushed into their 2020 plans.
Mason Foster’s best time here was when he was the mo next to Will Compton, but he’s also a veteran who knows this defense inside and out. There’s a case to be made for making him the mike and sliding Hamilton over to mo. I think I would probably keep Hamilton as the mike and slide Foster over to mo, though. Hamilton is smart enough to call this defense and took over that job at the end of last year.
Josh Harvey-Clemons also has a role to play. It seems logical he’ll play the same third down role he has over the last few years and really performed quite well in last season. With another year of NFL weightlifting and experience under his belt, he might be able to play the mo spot full time, though. He will be a factor in this competition at that spot, while Holcomb could play either spot.
All of these players have easier jobs thanks to how good the line in front of them. If Jon Allen, Matt Ioannidis and Daron Payne stay healthy and produce, the Redskins can still be good without a total stud at linebacker. However, having one who could be a game wrecker gave this defense extraordinary potential which disappeared before the first period of OTA’s was complete.