Yup, this argument is pretty much past its time.
Based on comments on ANN.lu 12 years ago by Ralph.
Since then Morphos has gone through at least one rewrite and has shared code in it from AROS. Not to mention it has been 12 years. I doubt much if anything is left of the code from that time. Morphos' codebase is closed source anyway. As is all of the versions of AmigaOS. Impossible to prove anything.
Not to mention, What is the point? A reason to hate/dislike/jab at Morphos? Some people would just do that anyway. It's NOT AmigaOS is reason enough for some. So, let it roll like water off a ducks back.
I've got nothing else to say, nor reason to see this topic continue.