The problem is Kyle isn't fast enough with the puck on his stick especially through the neutral zone. He may skate fast but he doesn't carry the puck with speed well or tilt the ice. PLD plays allot faster than Kyle or Mark with the puck which is one of the reasons why he tilts the ice IMO. In Murat's article there were some nice isolation video showing how PLD has speed that backs off defenders and really only Ehlers has that speed on our team IMO of course.
Connor is fast with the puck on his stick, he just plays a more west/south game when coming through the zone and attacking. He doesn't have the size like PLD to break through the seams or the pure speed like Ehlers to cut through but he has perhaps the best pure hands on the team coupled with good speed to weave through.
PLD is good don't get me wrong but his skating isn't on the level of Ehlers or Connor. It's a lot closer to Scheifele than it is to either of those two.