If I'm a betting man, I'm willing to wager that staff cohesion and recruiting fit are extremely important to Mario, especially with how poor the staff fit together this past year. Arroyo may have never worked with Mario at Oregon and low hanging fruit, but he's a California guy that has never worked west of the Mississippi. Smith, Field and Mirabal all have local ties in some regard.
Coley makes a ton of sense on staff as WR coach and/or co-OC and the primary playcaller may not necessarily have previous ties to Mario, but **** well have experience in the region.