Let us take a look at how teams will look like with or without Kevin Bieksa, since teams are expressing interests at the very least on the top-4 defenseman of the Canucks.
If the Canucks hold on to Kevin Bieksa, the top-6 looks like:
Hamhuis - Ballard
Ehrhoff - Bieksa
Edler - Salo
...when everybody is healthy.
If the Canucks trade Bieksa without a replacement:
Hamhuis - Ehrhoff
Ballard - Bieksa
Edler - O'Brien
Essentially, O'Brien will replace Bieksa with his own piece of toughness and grit on the back end. However, O'Brien isn't nearly as prowess as Bieksa in the puck moving or shooting department. Bieksa is a reliable 40-50 point player when healthy for the full 82 game season. No more skate lacerations on his leg please.
If and when San Jose Sharks acquire Kevin Bieksa, their new top-6 will be much improved and look like:
Boyle - Vlasic
Bieksa - Murray
Huskins - Demers
The retirement of Rob Blake will impact the Sharks in that the team is short of a very strong and stable force on the point in the powerplay unit. By adding Kevin Bieksa, they have added another guy who has the ability to share the puck and shoot himself.
If the Sharks stay put, without Bieksa:
Boyle - Vlasic
Murray - Demers
Huskins - Wallin
The team will be relatively shallow in the back end and nobody after the top pairing would scare off the Sedins, Kopitar, Kane and Toews, Datsyuk and Zetterberg, etc. Doug Murray knows it. That's why there is a reported offer to Canucks involving Derek Joslin and a 1st for Kevin Bieksa.
The LA Kings are another team desperately trying to improve their roster in the off-season to build on their playoff-bound team. Dean Lombardi tried to acquire Ilya Kovalchuk as a key UFA to no unveil, and never stopped searching for a good top-4 D since July where the key free agents all signed for big dollars and terms. Dan Hamhuis quickly came to agreement with the Canucks for 6-years and the rest is history.
If the Kings add Kevin Bieksa, the top-6 becomes:
Doughty - Bieksa
J.Johnson - Scudari
Drewiske - Greene
But without Bieksa, Kings have maybe one of the most penetratable defense in the West:
Doughty - J.Johnson
Scudari - Greene
Drewiske - Harrold
So obviously, it does not surprise any that the Kings are looking at multiple options such as acquiring Bieksa, signing Willie Mitchell or make a trade with another team to improve its defense.
If George McPhee let go of Joe Corvo this off-season, he may be looking for a possible replacement to play a steady, top-6 role for the Caps.
When Bieksa comes into the mix:
Green - Schultz
Bieksa - Erskine
Carlson - Alzner
Erskine - Carlsson
Alzner - Sloan
Apart from Mike Green, the Capitals have good specialized D-man such as Schultz on the PK, Carlson and Green on the PP, etc. Kevin Bieksa is a pretty versatile minute eater they can use.