even if you have cleaned the visible part of the cylinder wall, there is still a faily long portion of the cylinder wall you can't reach., below the piston tops. Part of your scotchbright is now sitting on the piston rings.
Since you intent to replace the pan gasket, I would strongly suggest you take thoe pistons out and clean, clean, clean.
If you intent keeping the car, this extra effort will prevent you from doing this job again in a few months.
But it's your car.......