Hi Doug,
This is not, AFAIK, one of his documented murals. However it could be that he had a bunch of kids work with him on this. One has to ask why it's not defaced. It could bbe that it's so valued by the community and respected. Of course, as you suggest, it could be an homage.
I'd like to see the rest of the mural if you have it.
Thanks for bringing this to us!
Asher