We don't know those hops are on Cox. We know the Hop 5 responding router to the ping request was Cox, but the next one COULD be Level 3 or some other back haul system.
Just because a ping isn't returned, doesn't mean it's a bad thing, OR a problem. Ping Requests have the lowest priority and routers can be configured to ignore them totally, OR, when the are busy, to ignore them. Remember your ping is measured in MS, Milliseconds, with is a Thousandth of a second.
BTW a search on the internet also returns this jewel - "Ping is measured in milliseconds, and the higher the number, the worse the lag time. Ping of about 100ms is considered average, and ping of 50ms or less is ideal for online gaming. Any number below 20ms is excellent.".