I've been pretty high on Kleven since we drafted him, so I've pretty confident in his ability to step in. I remember having similar conversations about whether Sanderson would be able to step in immediately as a top 4 Dman, I have about as little doubt that Kleven can step in as a bottom pair guy. Having said that, I would prefer if we had a more reliable partner for him than JBD, but it is what it is.
Jensen is a proven vet, he was on Washington's top PK unit so I don't see it as a big ask for him to replace what Brannstrom did and then some.
Our D pairings on the PK last year looked like this:
PK 1 Sanderson-Zub
PK 2 Brannstrom-JBD
extra: Chabot
This year, it will be this:
PK 1 Sanderson-Zub
PK 2 Kleven-Jensen
extra JBD
Which would you prefer? to me, the answer is a resounding this year.