Despite losing their Offensive Coordinator and the TE-coach / passing-game-coordinator, I am really liking the Rams' Offensive Staff. Adding Liam Coen and Greg Olson, plus an experienced coach in Jake Peetz would seem to more than just off-set the losses, including offensive-assistant Chris O'Hara who joined O'Connell to MN.
When Coen first joined the Rams as an assistant-WR-coach, I thought he was a little goofy-looking, and did not give him much thought over the next three seasons. My Bad (I'm the goofy-one). When O'Connell was rumored to be a candidate for several jobs, I started thinking about who could replace him; and like many others, thought about Coen. So I started reading, and found plenty to be impressed about. Coen has at least as many credentials and as much of a resume (if not more) than Matt Lafleur, Zac Taylor and Kevin O'Connell when they were first joined the Rams.
The one thing Coen lacks is coordinator-level-experience in the NFL. That's where I really like the Greg Olson addition. Add-in that Olson has worked under McVay with the Rams, and I would expect a seamless-transition. Now I don't know Peetz at all but he has NFL experience; and has worked with McVay. Both plusses.
Factor in the return of well-regarded Thomas Brown, a top-WR-coach in Eric Yarber, an OL-coach that I think did well in his first season in Kevin Carberry and another young offensive mind/former-QB in Zac Robinson ... and ... that's a formidable offensive-staff. And the Head Coach is OK too.