To me it comes down to them breaking the law and breaking the NFL and NFLPA determined protocol, along with the predetermined actions that should be taken from such violations, whatever those were.
Given the break in protocol, I think it makes perfect sense for them to have to quarantine for the 8 day incubation period, which doesn't have anything to do with discipline. But that doesn't seem like it will happen. My guess is they will just be fined, which sets bad precedent, in my opinion.
I don't think it is that simple given the incubation period that can last up to 8 days.