Oh ok. I assumed the stave was triangular shape so the deeper you go the more narrow. You are ok. The rings look good to me, thick, and flat.
So if that blotchiness is sapwood-related then, yes, just scrape it off. Get down to brown wood. The ring is thick so you don't have to worry about going too deep. Just use a scraper and not a draw knife.
Is there enough wood for a handle or do you plan to glue one on?