As I mentioned almost a month ago, it's a herniated disc. This is not something that is really predictable, which is why the team's updates are so vague and there is no linear or clear time line to return. Getting on the ice does mean it is better, but it's also testing it with the risk of making it worse. I suspect he'll get surgery in the offseason and should be ok for next year. It's really a matter of whether he can return this year and if so, be in top form down the stretch. It's certainly possible, but just not predictable. There is no use getting upset at Ullmark or the Sens. I don't think this was a previous or undisclosed injury before the trade, at least not to any degree to what he is going through now.
As to why they haven't disclosed the herniated disc, I have no idea. I've thought about this, and thought they just wouldn't at first hoping it would heal and they wouldn't set any alarms bells off. But given the extended time off, it is strange not to come clean. Every injury has a name, term, diagnosis or designation, so kind of weird not to just state it publicly. After 6 weeks, you'd think they would update it. But I think that might be the good news - it sounds like he really is getting closer to returning and feeling better, so they feel they have held quiet for this long, what's another week. If he doesn't play before the break, I'd be surprised if they didn't disclose the issue then.
In the mean time, Leevi is rock solid, and Forsberg already stole a few wins for us against T.O and NJ. There is reason for optimism given the new found defensive structure this team has embraced.