Well sure, some of our better prospects are better than bad NHLers but I don't think that's a good reason to bring them up yet. I think that kills development. I've used this example before but if you're not any good at faceoffs you're probably not going to learn by losing ten of them per night against Brayden Point, Crosby, Barkov, O'Reilly, Larkin, etc. right? Likewise you're not going to learn to shoot well if you come to the NHL and defenders close on you more quickly and you can't get your shot off at all, and when you do you're trying to beat Sorokin, Shesterkin, etc.
My philosophy is bring prospects up when they're ready. When you're satisfied with their all around game irrespective of their ceilings. Like, right now Edvinsson and Berggren have nothing else to learn in the AHL. Their all around games are dominant. So bring them up. And then fill the rest of the roster with vets. Kasper isn't even a 1C in the AHL yet and we're really counting on him being a 2C in the NHL one day? Let him be a top guy in GR for a season and work on his game, then see if he's ready. Until then, Copp and Veleno will do.
This is just my opinion but I think all guys naturally get "faster" as they gain muscle and develop the lower body strength to move their frames around the ice. Seider is still a young, skinny, kid. Once he's squatting 400 lbs he'll be plenty fast.
Different thing than "playing fast" though. And I think this is a more important skill. Moving your feet all the time and playing with "pace" is more important. Look at David Perron. Slow skater but never stops moving so he keeps up. Mark Stone is the king of this. Now compare that to Anthony Mantha. Mantha is a fast, powerful, skater who only really skates in transition. The rest of the time he's coasting, so his speed doesn't really matter much.