What I see is that the players on that line all bring different elements and strengths and together have chemistry. Perreault is the set up guy, Leonard is the physical force with a shoot first mentality and Smith has the best skating but also he knows where to be and he gets there when he needs to. When they go their separate ways it will be interesting to see how they will do because they are all going to have find new chemistry with players they're not familiar with. I think it bodes well for Perreault because he has very line oriented skill set somewhat similar to Panarin's but not quite as good of a skater......he'll have to work on that. I've seen a Marc Savard comp today but I've also seen that before. Gabriel does have an uncanny ability to make something out of nothing and he's stronger and more ready to battle for pucks than I thought going into this year.
Personally I don't like other teams. That said I don't see much point in running down either Smith or Leonard. I think they're both excellent prospects too. It's always easy to like your guy best. What I'm seeing so far though is Gabriel even if he went later in the first in last year's draft hasn't taken a backseat to Leonard or Smith at all and I like that a lot.
Leonard is the best skater but aside from that I think what you're saying here is exactly what is worrying about Smith. This isn't the guy carrying the transition/retrieval load or facilitating offense once the puck is in the OZ, most of that work is being done for him. As mentioned earlier, he's really overrated as a passer. He'll flash some really good deception but he beefs too many simple plays. He also is almost primarily a guy who needs space to create and he isn't very good about opening up that space either.
tl;dr - Smith needs more help to be successful than the other 2. There is no doubt that they all feed off one another but he has more hurdles to clear than the other 2 and he has the lowest IQ/poorest fundamentals of the 3. He has a long runway at BC and I hope for his sake the Sharks let him use it but there are more than a few orange flags trending red in his game for me.
I actually like Leonard the most of the 3. I feel like everything he does translates to the NHL and a lot of what he does for that line goes unnoticed because it isn't flashy or obvious. Hes the lowest maintenance of the 3 as he needs the least amount of help in order to be impactful.