With Stauffer and Rishaug now confirming Kane is likely going on LTIR, we can probably afford one but not both.
Walking away on Holloway seems like a no brainer to me. I've never seen the long term upside in the player- I think he's a bottom 6 forward in his prime, and this year he's likely a 4th liner with limited special teams time. In no world can I justify paying him 2.3 when Brown and Janmark make less than 1.5. It sucks to lose him for a third, but I think you can find a comparable or even better player in the $1-1.5 million range, either now or at the deadline.
Broberg is a lot tougher for me. If he can continue to play in the top 4, $4.5 for two years is a bargain. Top 4D are at a premium, particularly if they can play the right side. He's also got a much higher upside, and plays at inarguably our biggest position of need in both the short and long term. In the short term, if we walk away from him we have Ceci and Brown as our second and third d for the season, which is a disaster. We can hope for an upgrade at the deadline, but I hoped for the same last year and it didn't happen. I'm much more nervous about losing him than I am Holloway. Having said that, the risk is obviously higher as well. If he drops the ball in camp the way he has the last few years, that's an anchor that really hurts your chances.
If it's me, I probably match Broberg and walk away on Holloway.