Hi Lawrence,
I’ve done many multicam edits in Resolve, but I’ve not worked with an OTIO import yet. I imagine your Rode timeline links to the source clips right? That’s problematic because to edit multicam in Resolve you must create a multicam clip from your sources first and then edit that clip in your timeline. If you are just replacing a few shots it’s probaby just easier to edit them in manually. I assume you have matching TC on all of your sources? That will at least make it easy to find the right shot.