It became clear when Mark Davis was looking for the next GM for the Raiders this offseason, he wanted a package deal with the head coach. The hope being that the two of them could come in and instantly be on the same page and therefore hit the ground running.
Enter former (com)Patriots Dave Ziegler and Josh McDaniels. Two guys who go as far back as 2010 when McDaniels was head coach of the Broncos and Ziegler was hired as a player personnel assistant. The two were reunited in New England with Ziegler hired on a personnel assistant with McDaniels having gotten his job back as Patriots offensive coordinator.
McDaniels kept that job the past ten years while Ziegler worked his way up the front office ranks. So, you could say they are pretty familiar with each other. It makes for a lot of agreement on prospects during the draft process.
