This is false, Stone sucks and can't even play bottom pairing let alone top 4.
Unfair... Stone's a solid #6 defenseman, maybe one of the best in the league in that role. He's paid more like a #4 so sometimes it can be a bit concerning that he lacks the trade value to make room for raises to some of our RFAs, but you can't say he can't play bottom pairing. If Mike Stone is your sixth best defenseman (which he is even among our vets group, never mind Oliver, Juuso, and Rasmus) you are in a very healthy position.
If you care, here are the 5-on-5 stats for the five pairs Stone played any real minutes on last year:
Kulak-Stone
661.88 minutes
52.8%xGF
Brodie-Stone
163.08 minutes
54.11% xGF
Bartkowski-Stone
113.38 minutes
39.15% xGF
Giordano-Stone
80.43 minutes
54.79% xGF
Stone-Hamonic
63.5 minutes
39.84% xGF
When Stone was paired with one of our three NHL LD, he posted at least a 52.8% expected goals for. Sure, one of those pairs doesn't belong in the NHL - because Bartkowski is not an NHLer. And sure, another one of those pairs is just idiotic -
Stone is not a left side defenseman. But the other three pairs are exactly what you want out of your #6 defenseman - who also has quite a rocket of a slap shot when he has Brodie to set him up for it.
If our bottom pair had any issues last year, it was that Kulak as our #5 just didn't have that natural chemistry in setting Stone up for the one-timer that Brodie did. I think Kylington has a better feel for that offensive side stuff. Still, our third pair was exceptionally reliable defensively and they broke the puck out as well as you would want a third pair to - even if Kulak had to do a good bit of the heavy lifting it wasn't a case of one guy being anchored down by his partner. Our bottom pair defended the middle, they won their fair share of puck battles, and they were solid on breakouts. Of course Stone isn't perfect - if he had the skating to be tighter in the neutral zone it would be huge, but that also applies to Hamonic who plays bigger and tougher minutes.
If Andersson is an upgrade on Stone, it's because Andersson is very good, not because Stone is bad. Replacing Engelland with Stone was a very good thing and last year we had our best third pair in ages, dragged down only by a terrible season teamwide in shooting percentage.