First off, scouts do go to local amateur games, and they definitely went to games when Saad played for the Hornets. Being that they in fact had seen him play and develop, they should know exactly how he plays the game when healthy. What they failed to do was to properly identify or give enough weight to the time period in his draft year when he played through injury and underperformed (or "wasn't trying", as it was spun). That was where the Pens scouts, having seen much more of his amateur games than any other organization, should have had better judgment, instead of relying on whatever handful (or less) games they scouted during his first season at Saginaw.
This is exactly why you need to talk to coaches. Not sure how many games you think the scouts actually watch, but it is only a small sample of a player's season, and is only one aspect of their job. If the scouts see something that doesn't match up with what they've seen in the past, then they will absolutely talk to coaches, trainers, players, etc. to ask why a player wasn't making strong cuts, avoiding contact on their left side, slower acceleration, etc. Saad should have been a gem that the Pens had the inside track on from day 1. How did the scouts fare on Morrow again?