What a wonderful outcome to your story Vidya.
Were you ever able to ask Rodrigo (yourself or through one of the shamans) if he joined with you purposely, maybe as some sort of teaching and/or protection for you? I say protection as you must have been quite 'open' to enable him to join with you without you being aware of it. If you have aphantasia (wow, never heard of that before either) maybe he knew there was something around you that you couldn't 'see' and he was able to block it, or just give you that protection when he left? But sounds like he was certainly able to help you on your journey by joining with you like this.
I wonder if it's the same or a similar thing that it's said some indian gurus do with their followers/disciples when they pass over so as to pass on special knowledge to them, which is apparently a real honour. Hey, maybe that's how the Dalai Lama continues on -- 'dies' and just goes off and finds another body to join with, waiting there until his followers find him/her and bring him/her home again. I guess it would avoid the 'forgetting' part of reincarnating here to a good degree.
It certainly all sounds 'real' to me, with all the synchronicities and validations you received along the way from so many sources.
But, as you say, leaves so many more