Last year he led the league in pocket passing. I think this year it's a combination of playing hurt since week 1 (let's not forget he's playing with two injuries on both legs, that is very significant) and the oline being worse than ever. I think Locket being injured is also a factor, probably a minor one but it's still an issue and it seems Doug Baldwin is getting all the attention from defenses - teams put their best guy on him and/or double team him.
Going cheap on the online is fine when Russell is mobile but taking that away from his game while the o line is this bad with no running game is a disaster.
Going cheap on the online is fine when Russell is mobile but taking that away from his game while the o line is this bad with no running game is a disaster.