McVay seemed to almost burn with intensity in that press conference. I haven't seen him with that level of focus in front of the press for a while. IMO he realizes his team could have played with and done well in this past year's playoffs and he is hell bent on recovering that playoff form.
I've always believed you're only as good as the people who work for you. Last year Waldron was not ready and you could see it from day one. Kromer I suspect led the Rams to believe they were good to go on the OL interior and IMO was out-gameplanned in the run game in many weeks. There were also guys on the staff that added nothing i.e. weren't able to step up and take up slack like Fisch. McVay is seeing the truth in things IMO and is counting on O'Connell in particular to turn those things around.
Also because of how things went down with the OL last season I suspect there were probably conversations between McVay and Snead re: the coaching staff's role in draft evaluation and roster building. I have nothing to prove this just opinion and following the logic of how last season went. I am guessing Les will squelch the voices a bit wrt the depth chart and roster build as it pertains to the assistant coaches and maybe that's part of the rationale in his new coordinators staying home for the combine.