There is nothing to worry about there. The bearing has a micro coat of the grey color you see for break-in. That coating is not presicion applied, more of a spray on/dip deal, and it will have high and low spots that the actual machined bearing surface does not, hence the odd pattern you see.
And the scuff's you think you see are actually the machined surface of the bearing, not a wear issue.
Take a brand new bearing out of the box, and LIGHTLY with fine scotch bright, gently scuff the grey coating and you will see a shiny bearing surface under there.