No it is not. It's literally
the bottom of the food chain. I really don't understand why you would post on a topic you don't have a baseline knowledge in, as opposed to just asking one of the many posters here who wrestled.
Amateur wrestling ranks roughly like this:
1) Olympic team
2) US team
3) Division I
4) Division II
5) Division III
6) NAIA
6) NJCAA
Jon Jones did not have a 'long career in combat sports' prior to joining MMA.
He wrestled for 3 years of High School and 2 years of the lowest level collegiate wrestling that exists.
Jones was successful in wrestling for the same reason he ran roughshod over MMA - he is an elite athlete, and that is an absolute rarity in 205/265.
Elite athletes that size will attempt to enter other professional sports before MMA, because the starting pay is literally 15k to get your head punched in.
This is common sense and shouldn't need to be explained.