u don't need to prove it this way you know. Just a regular deck rate that is exceptionally done can earn u the name u wanted. I mean, to prove that you're the best, you need to basically beat everyone with the worst deck one can build against basically a tourney discard deck (as in everyone has the discard deck and you have the crappy deck). If u can do that, congrats on doing the impossible and you're the best.
Yeah, the deck rate is still easier. Shows how flexible u are as a duelist and makes u look much better than just winning a duel. Remember the winning formula:
good = flexible with many decks, good natured, sportsmanship, etc.
better = very good
best = impossible (okay, maybe not on the board. lol)
Anyway, try the method. I bet you can get more respect that way too.