Stone would be a good third pairing/7D option if we didn't have so many other options in-house already available.
Skjei-Trouba
Staal-ADA
Smith-Fox
Hajek-Rykov
Lindgren
The only place for Stone would be on that bottom pairing, and as it is right now, we have a few in-house players, as listed above, that I think the team would prefer to go with over Stone.
Maybe a PTO for camp and then if they feel the kid(s) aren't ready for the 3RD spot out of the gate, they sign him to 1x1 and then have him play there until they feel a guy or two in HFD is ready to come up mid-season and then keep Stone around as 7D for the remainder of the season or something.