The thing about Gregoire is that he's still on an AHL deal meaning he's not NHL eligible at the moment, and while he put up decent numbers in the AHL, from my perspective he doesn't look like he's gonna pan out to be an NHLer but you never know.
Fear the Fin interviewed a few pro scouts regarding Sharks prospects:
https://www.fearthefin.com/2020/2/20/21145160/san-jose-sharks-barracuda-prospects-scouts-blichfeld-gregor-suomela-letunov-chmelevski-gambrell
Here's what the scouts had to say from that article:
Thomas Gregoire
Scout #1: “I’m not sold. If you’re a small player, you better have a high upside in something. Skating, skill, hockey sense, you gotta have something.”
Scout #2: “You can see his skill, the way he sees the ice. He’s jumped out when I’ve watched him play. He can do some special things with the puck.
“But I don’t know if he’s a great skater. It’s so hard to be a smaller defenseman in the NHL. You gotta be a pretty dynamic player. I’ll never write anybody off for being too small, but you wonder what his role is going to be at the next level. That’s a tough one for me.”
Scout #3: “He has some offense in the American league, but not enough to translate to the NHL. He won’t be playing PP at the next level. And he’s terrible defensively.
“I thought for a second, maybe this guy’s got something. But he just doesn’t have enough to round it out.”