If Quinn is taking someone, its probably Travis Jones.
Jones is the only hand-picked coach by Quinn.
All the other guys were on roster:
Seahawks have 3 in house candidates that can be promoted:
Rocky Seto
Kris Richards
Ken Norton Jr
And they all make sense...
Seto was a former DC for Carroll and he isn't locked into a coaching position, he's more of a specialist coordinator for the Pass Defense.
Richards has a lot of respect and the L.O.B. support him. If Richards gets promoted, Seahawks already have Marquand Manuel in the wings to take over the DBs if Rocky Seto doesn't.
Norton is intense and I feel he would be the best for the job with Pete in his ear. He's more of big voice but you can't deny the results he has gotten from the LBer corps. Seahawks quietly have one of the most underrated LBer corps in the NFL and they can do it all plus tackling, plus coverage, and plus pass-rush. So he's a good coach too as well as a big voice.
But a lot of peeps here have said Norton doesn't want to become a DC.
If Quinn leaves though which seems likely from all the reports...
I don't think this defense loses a beat... Seahawks just have a good core of veterans/young leaders secured:
Earl Thomas
Kam Chancellor
Richard Sherman
Bobby Wagner
KJ Wright
Michael Bennett
Brandon Mebane
Cliff Avril
That's 8 of your 11 starters.
But if Quinn does leave and takes Jones with him... that D-Line spot looks like it will be a big one to fill.
I'm not going to research the names out their that can fill the roles but I do know their is a guy in Buffalo, who is kind of green behind the ears but has his hand in coaching up some pretty elite lines (NYJ 2013) and (BUF 2014) by the name of Anthony Weaver.
Never mind it looks like Weaver re-joined Pettine in Cleveland.
Also, I've now just read the Quinn will keep current Falcon's DL Bryan Cox, so its likely that Travis Jones will be DC there, or the Seahawks will keep Jones and one of the other 3 coaches will become Quinn's new DC. Quinn should just leave the Seahawks be and hire Jim Schwartz if he's still available, lol.