[elgyqc]

For me the question is... is it going to get worse and destroy the engine? That scratch looks to me like it happened as an isolated event, something was in the cylinder, made a scratch and left. If it had been there for more than one stroke it seems to me it would have made multiple marks, in straight lines. As for the other marks... who knows. If someone has taken apart engines, noted minor anomalies, put them back together and run them I would love to know the results.
If it was my engine I would likely put it back together, forget what I saw and keep a close eye on the oil filter for metal shavings. But then I tend to be a shade tree mechanic.