Wow, you bring back memories .... and I listened to all that you mentioned and had forgotten about Return to Forever !!
In my 'Whose Got Vinyl' series I did a blog about Mahavishnu Orchestra here ... you may enjoy the read and listen.

I am going to dig through my vinyl collection and find my Return to Forever albums...Where Have I known you Before and Light as a Feather ... Chick Corea was a master !!