I think there could really be a deal to be made here, having both Gelinas and Weircioch seems a bit redundant. IF they've pretty much already determined that they need to make space for Bigras anyways, the odds would be pretty good that either guy would sit on a nightly basis anyways. There was some smoke that the Oilers were interested in Gelinas earlier this summer. If the Avs had to pick, I think they would surely keep the guy they just signed as a UFA rather than the guy they acquired at the TD last year.
I think it probably matters more on the other guys that they've evaluated (Bigras/Siemens/Lindholm) so far in training camp. If some of those guys can step-in and fill-in just as well as Gelinas would as depth defenders, then making this kind of move is a no-brainer. It takes a depth d-man making $1.575M out of your lineup, gives a chance to a younger guy (Bigras would definitely make the squad, I would think) and it adds some scoring potential to the lineup.
As a bonus, it would probably end the Rene Bourque experiment as well. (I think he's had a good camp but I don't trust that he keeps it up all year long.)