I'd say they've been pretty ruthless with Sillinger's development, he has been thrown to the wolves in a sink or swim fashion. I've got the feeling they are not so hung up on his upside and care more about getting a solid NHL player. I might be wrong, it could also be that was just their read on what's actually best for his development and they have such a great faith in his ability to adapt and grow that they felt there's no need to protect him. It's just while playing in the NHL above your head is not usually great for offense or confidence, it teaches you to survive against tough competition and it would seem to me bottom-6 or especially 4th line roles are a lot about that, just try to survive and keep it 0-0.
I've obviously been a harsh critic of the front office of this franchise for a long time, but.......
They may have done exactly the right thing with Sillinger. Your post is probably a very accurate assessment of the FO thinking on Sillinger. Last year was a lost year for the team and even though Sillinger had a crap year, he got some very valuable experience. I'm sure that he was projected to be more of a grinder by Jarmo & Co. so his lack of statistical accomplishment last year probably wasn't much of a concern to them-and evidently correctly so if this was their thinking.
He's obviously not going to be a star. But he has shown a much higher level of play this year than last. I've made reference to his dad, Mike, before in discussions about Sillinger. His dad carved out a very long NHL career as a "lower in the line up" type of player and it looks to me that this is the path of his son as well.
I don't have any idea if Cole will last near as long as his dad did in the NHL:
Mike Sillinger Hockey Stats and Profile at hockeydb.com. Probably not because dad had a very long career.
Dad played in over 1000 NHL games and was a 0.5 PPG type of player. Son looks like he's tracking dad's career at this point. He can skate at the NHL level. While he's certainly no McDavid, I don't sense the major deficiencies in his skating that others here do. His skating isn't going to take him out of the league at this point.