I do think the Flames are going to move a defencemen - or two.
Hanifin - Andersson
Weegar - Tanev
Kylington - Zadorov
Mackey - Valimaki
Meloche
Stone is not on this list, but until I see Stone sign somewhere else, I will just anticipate him re-signing in Calgary as he wants to be here, and Sutter seems to like him too.
That looks like great depth - until you realize that both Mackey and Valimaki are waiver required players this year (so are Meloche, Poolman, and some others but I doubt any of those would get claimed).
https://www.capfriendly.com/waivers-calculator
Question is, what teams are short on D? Who would be interested in Valimaki or Mackey? Or Kylington? If the Flames don't re-sign Stone and decide to carry 8 D, then I guess Meloche would MAYBE get picked (if a team is looking for toughness - Meloche is tough, and seems to be trending into an NHL regular - 50 NHL games last season).