I'm not sure I agree with that. Is there something you're seeing that I'm not? They look pretty on par to me.
Part of the argument is that we don't know how much his usage affected his stats. There are some good estimates, and there was an article floating around about the Stuart effect, that would project Trouba to be on par or slightly better than Rielly. Also, are you aware that on top of Rielly's 5M that he makes another 2M in signing bonuses (two years in a row, and again in the last year of his contract)? Klingberg's was a great deal but he signed in April of 2015. Maatta's deal is also great, but he also signed mid-season and he's a young D on a cup winning team. Josi (assuming this is who you meant) signed in 2013, and he's 26 now.. not sure why he's on your list. There are contextual factors to all of these, but that doesn't take away from Trouba's value.