Hopefully it can happen. Will be on of the greatest UFA signings Calgary has made if not the best one.
I think you sign Hall and worry about signing the rest later. If you can manage to assemble a team with Gaudreau, Hall, Lindholm, and Tkachuk as your wingers you do it. One of Gaudreau/Tkachuk would need to play RW. If you cannot, then you have to shop Johnny G. The cap remaining flat really hurts us though (especially with Brouwer and Stone buyout $'s taking a little bit of the cap, and Lucic), and we still need to sign a serviceable 1B to back up Rittich. Don't think Talbot stays unless he accepts the same amount of money or term. On top of that, we still need to figureout if we are considering re-signing one of Brodie, Gustafsson, or Hamonic as a top 4 D. That, or we just bank on Valimaki/Kylington filling in the #4 spot while we try to figure that out.
Lots of decisions to be made for Brad, arguably the biggest offseason in terms of finding a clear direction for the team, and whether or not the core we currently have should stay intact.
Regardless, Hall should absolutely be priority number 1 come the first day of free agency. Who knows, maybe he takes term over cap $'s because of COVID, one can hope, especially a Flames fan like me.