Fleury last year in Laval was impressive with the physical game, scoring goals, moving the puck. But struggled with his defensive play especially when paired with Ouellet. So I am surprised that Fleury is even in the NHL although I started to wonder if he struggles were more due to Ouellet but on the other hand Ouellet hasn't looked that bad defensively so far this year but he's at RD instead of LD so I don't know what impact that has on his game.
Juulsen clearly has the better defensive game then Fleury or Brook, as it's his bread and butter but he doesn't have the skating/mobility/speed and puck moving abilities that Fleury or Brook have.
It will be very interesting to see what they do, the good news is there's no rush so they can bring Brook along slowly, let Juulsen find his game in Laval and hope that Fleury can progress at the NHL level. Then go from there as far as trying to figure out what to do with Petry/Weber at some point.
What they need is one of Brook, Fleury, Juulsen to turn into a top pairing D on a contender, which is a huge ask and unlikely to happen just based off where they were picked. I think Brook has the upside for it but I'm starting to have doubts that he will reach it. As I said it's early for all involved so we'll see how things look by the end of the season.
They also have 3 D in Norlinder, Romanov and Harris who can play LD or RD equally so while we have the need for LD's much more as long as Mete holds his own which should be the case, then in a few years you could have Struble coming up if he can progress but for now is more just something to dream on. But out of Mete, Norlinder, Romanov, Brook, Harris, Fleury, Juulsen, Fairbrother, they should at least have a very solid group in say 2-3 years with hopefully Struble not far behind.
Of course it's unlikely that will reach their ceilings and some may not progress, plus there may not be a top pairing D at LD or RD and that would then present a massive problem, in terms of on a contending team at least so then you would have to hope that someone can step up by the time we are a contender cause trading for one will be very difficult.