Well, I’m in favor of defensively sound LHDs that won’t screw things up as they get carried by Bogo/Risto. Sounds like he is the complete opposite of that. Whereas Weber and Gorges are the of right style, just with disappointing quality.
the more chemistry and experience they have together, the more sound Weber will become as Risto's partner.
Colaicovo has played and played well when paired with a good partner, not sure if he and Bogo would have the right mix, but it's possible.
And Pysyk is also a strong wildcard in this LHD mix.
I don't think adding Franson would have anything to do with finding a LHD for Bogo or Risto
If they do sign Franson and it is true that he is much better on the right than left (as jawallstar relayed) then I suspect they will try him at 2nd pair RHD, and they might try Risto on the left, an idea that Bylsma has already floated aloud. Otherwise Franson goes to the 3rd pair and they try Pysyk on the left, I guess.
3rd pair RHD, with limited D zone/matchups, but with a key role on the PP.