I'm a whitebelt. I've trained an accumulative of 8 months in a period of 2 years. I've almost tapped a purple on my first 3 months. Now in the gymn I am now, I have tapped one blue belt. We are 2-2, I get a quick submission or if it goes a little longer he dominates me. THe other blues I hang in there, I defend myself, but I can't get a decent submission attempt.
In my opinion it's because I'm freakishly flexible. i have gotten armbars on me, like newton had on Ryo several times, but I can manage to twist myself and get out, and becaue I follow mma and have watched some tapes, read a book, it gives me advantage.
So maybe because the whitebelt is so dedicated he can hang with the superior belts.