As a former D2 wrestler, I found the level of D2 and D3 wrestling to be pretty equal to each other, with D1 being quite a bit ahead of both. If you want to think of it this way, D1 is is the MLB, and everything else (D2, D3, NAIA, etc) is a similar level of minor league ball. I had a teammate who was a 3x D2 qualifier and 1x All American, and he would get spanked by D2 champ who transferred out of D1 after not cracking the lineup. This isn't meant to disparage anyone or say that Endene can't compete in D1, but as a whole, D1 is a significant step up from D2/D3, etc.