Karlsson is an upgrade, but also redundant with Letang, unless they think Letang is finished and they need a PP1 QB.
In which case they're rearranging deck chairs.
The 1st and 2nd will hurt a talent pipeline ranked 29th by Wheeler in January.
And if this was Karlsson's "last hurrah" season, they're looking at $10M a year for the next 4 seasons.
Pens are really cap strapped, they're basically working off Guentzel's LTIR, but he's supposed to return by Christmas.
Next season they only gain Carter's $3M.
Jarry is a middle of the road goalie.
Graves was signed to a 6yr/'$27M deal by Dubas. Pettersson is a solid D-man, but your bottom three are Joseph, Ruhwedel and Ty Smith.
Old team that has to hope for a miracle from the Hockey Gods, aging curves suggest a collapse is more likely:
Crosby (36), Malkin (37), Rust (31), Rakell (30), Smith (32), Carter (38), Ellers (34), Acciari (31), Nieto (30)
Karlsson (33), Letang (36), Ruhwedel (33).