So, with Rivera as the 'early leader' - who would he bring in as staff?
If Rivera could have a San Diego staffer, he would. They can't force San Diego to allow coaches to leave on lateral moves (which is clarified by assistant coach v/s head coach - coordinators and Assistant Head Coaches aren't considered promotions). If John Ramsdell is available - current SD QBs coach - he might be the next OC. But the Chargers could still block the move. Ramsdell has been a part of the growth of Phillip Rivers and Kurt Warner.
On the other hand, expect the front office to have a lot of say in this hire, as they've indicated.
Rivera coached in Philadelphia with Brad Childress (99-2002) - LBs coach and QBs coach, respectively. Childress is a big name on offense that should have some autonomy, but also would be forced to take orders without having the keys like in MIN.
QBs coach: Brian Daboll - former Browns OC, Jets QBs coach. Daboll's available as a coordinator, but may not have the clout to get another job. No ties to Rivera.
OL coach: Mike Solari - last with the 49ers. Great lines of the Chiefs for years, has coordinator experience. Best available, but without ties to Rivera.
DC: First guess is that the Panthers' front office will take advantage of their interviews, and hire either Rob Ryan or Greg Manusky as defensive coordinator if Rivera would mesh with either. Ryan, the more outspoken assistant, wouldn't see as much media here, and has coordinated the 4-3 before.
With either of those coaches comes potential assistants: Ryan would probably include DL coach Bryan Cox, with Manusky might come DBs coach Johnnie Lynn.
Other possible staff?
*Greg Williams - current Assistant LBs coach, San Diego. College coach since 03, joined the Chargers in 09 - Rivera's first full year as coordinator. Williams was a WR/DB for UNC in 94-97. He's availble because he's a third-tier assistant - an assistant-assistant if you will. Could get a job as Safeties coach with a more experienced DBs coach.
*Cris Dishman - current Assistant DBs coach, San Diego. Has only 3 years experience at tiny Menlo college before joining the Chargers, but was a Pro Bowl player for years. Like Williams, he's a 3rd tier assistant who joined in 09. Another option to help coach a position on defense, would be familiar with the defense.
*Geep Chryst, late with the Panthers, has coached QBs and TEs, along with being an offensive coordinator. He was one of the league's first quality control coaches with the Bears at the end of Rivera's playing career (91-92). It would make sense to work him in somewhere.