Shore wasn't put in a position to develop offensively at the NHL level, plain and simple. And that's ok to some degree,t he road to the NHL is littered with lower-league high-scorers. Shore has always been a heady player but much like Lewis he doesn't have an above-average shot at the NHL level. They MAY have developed more on the offensive side if they were put in the top-six permanently but no team with either guy permanently in a scoring role is going to go anywhere. That doesn't mean they're bad, they're just not upper-echelon offensive talent. I'm a little miffed he hasn't done more as a depth scorer but that's also because he constantly rotates linemates--andreoff is utterly worthless. We saw what all three guys could do when the 'fourth' line was Clifford-Shore-Lewis. That's the PERFECT role for Shore and why he will be an NHLer for a long time. But he's miscast above.
I think it's fair to be concerned for Amadio's offensive development for similar reasons, they kinda look like similar players, but Amadio's done more with less historically, so it's important to see how he does in the pros and with 'scoring' linemates instead of depth guys.