Baalke hired that DC. If he is the type of coach that can only be successful with his type of players running his type of scheme, how was that not figured out during the interview process? Did Baalke do any due diligence? 

"Hey Ryan, we're gonna run with only two DEs this year. What does that mean for you?" 

"Well I like to rotate my dline a lot so we'll likely see a lots of plays where I've got 4 DTs on the field at once." 

"Great you're hired"

Goes back to the key problem. There isn't a core foundational vision shared by front office and coaching staff of who this team is, what is their identity, and how they want to play. Nothing is in alignment. That's how you end up with Nielson, who isn't a bad coach, trying to run a scheme that doesn't fit the skillset of our players.  Terrible match from a terribly run organization.

People have begun saying this a lot lately. 

Where is this information coming from? 
Who informed you that Pederson did not choose his own coordinator? 
Is there an actual credible report of this? 

Again - I'm not defending anyone in this organization right now because they collectively can't find a way to win winnable football games. 

BUT - this is the truth about the coaching staff hires and this comment came right after the team hired Ryan Nielsen:

When asked about the comments, Baalke did not deny any discussions about that part of the team's offense but did say that Pederson owns the coaching staff and that he supports him.

“Again, Coach [Pederson] and I, and ownership, we talk throughout the year and we’ve talked about everything. Those discussions will remain private, but at the end of the day, like I said, Coach owns the coaching staff. He’s held responsible for that coaching staff. I can tell you this, I have supported every decision that he makes, one hundred percent," said Baalke.

Also - everyone and their brother loved Nielsen as a hire based on his small sample running the falcons defense for a year and everyone from his prior stop praised him as more than qualified. 
Every write up about the guy painted him to be a "Don Martindale-lite" type of DC and everyone seemed to want that badly. 

If we're going to come up with criticism of the hire, it should be that Pederson saw a flash in the pan and thought it was gold but it turned out not to be. 

They thought this guy was smart enough to manufacture more pressure from the front we had in place + Armstead.
They were wrong.
They thought they could add two vets and a rookie to the secondary and give him what he needed to play more man coverage.
They were wrong and they got all the wrong guys for him outside of Jarrion Jones who is looking like he'll be a very good nickel.

I really thought Nielsen was a home run hire.

Shipley said it was the best move this team made in a long time.

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I'm assuming both Baalke and Doug interviewed the guy. If that isn't the case and only Doug was responsible for the hiring that would also be an organizational failure. Doug is an offensive guy. Baalke would have much more communication with him as DC in terms of trying to find talent that fits what Nielson wants to do.

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Scouting well is all that matters.  Draft philosophy is all fluff.

I'm assuming both Baalke and Doug interviewed the guy. If that isn't the case and only Doug was responsible for the hiring that would also be an organizational failure.  Doug is an offensive guy. Baalke would have much more communication with him as DC in terms of trying to find talent that fits what Nielson wants to do.

It's clear from the quote in my post that Doug made the decision to hire his own DC (as is the norm league wide) and the GM clearly stated that he supported that decision 100%.

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