Would rather see your entire team and league cats before commenting too much.
If the actual question is "Should I drop Talbot in order to pick up Berra?"
then I would say "NO". Nilsson has taken the 1a of the tandem no doubt, but NOTHING is certain in Edmonton. What I AM pretty certain is that Berra is more of a Khudobin type goalie to his team. He will ALWAYS be the #2 regardless of Varly being healthy and starting or Pickard jumping into the #1 spot if Varly goes down to injury. Berra had the same short burst hot streak in Calgary a couple seasons back and then promptly fell off the radar. I see no reason to roster Berra over Talbot.
Now if there are other FA's available, perhaps that would warrant a Talbot move, but for now, I think I'd just roster him on your bench. Keeper? If so, How many do you keep?