I would definitely replace the rings, they are unserviceable, and that is obvious damage.
The carrier internally in your third picture appears to be rough machining. This area does not interact with anything else in the rifle, so this should be of no concern.
Now, the damage internally to the carrier, where the gas rings ride, could be a concern. This could have taken place due to firing with the damaged gas ring. If this area is damaged enough, it could cause damage to any subsequent gas rings you install.
ETA: This could also be rough machining and the cause of the damage to the original gas ring set.
The area in your last picture is also of no concern, again, for the same reasons as photo number three.
I personally would replace the unserviceable gas rings, lube things up good in that area and see if the internal damage to the carrier affects the new rings you install.