Then you need more tests using different gear and stats in order to demonstrate that they are overshadowed by rank. That is the missing element in the proposed demonstrations. That is what would help to move the premise from likelihood to proven. You've presented evidence that rank is a factor. You haven't presented evidence that it overshadows all other factors. What happens when you use different weapons but keep rank and stats the same? How about when you change strength but keep weapon, rank and other stats the same?
You can't test only one variable and conclude that it is more significant than the other variables involved. You need to test all the variables separately.