I don't know about Ekblad's concussion history being so bad. I thought it was just one. Not that one is good but so many players nowadays have 1 or 2. IIRC his was a fairly serious one but he seems to have recovered OK, no?
People always bring up the risks involved in going UFA. Yes, they exist. Yes, they are substantial. And yes, every year lots of players do it - in spite of those risks.
Edit: I see people are complaining about this OT discussion. No mod has stepped in to move it. I guess we should do it ourselves.
Like I said before, Trouba and Overhardt will consider all these factors. It will come down to how Trouba chooses to weight the various parts of the picture.
ROR was traded to a bad team - after signing for at least 1 mil/yr more than he should have gotten. That is always a risk for players without protection clauses.