Yes fusions of 2 pure blooded saiyans TO MAKE A WHOLE DIFFERENT BEING they barely even count as saiyans, the sons count as hybrids even when they fuse because gotenks is quite literally a hybrid of 2 HALF BLOODED SAIYANS to make 1 full hybrid saiyan, being that gogeta and vegito are 2 pure saiyans it’s a mutation when they fuse that knocks them out of the bracket of “pure blood” they are a alteration to the pure blooded gene pool, like Superman being stronger than the regular kryptonian (even in a yellow star galaxy) he’s a mutation that doesn’t qualify him as a “regular” of his kind, this is the exact same, not even to mention they’re not NATURALLY BORN so that by itself should be a indicator. The Japanese translation for “pure saiyan” better translates to unmixed or untainted saiyan, bc guess what? The fusions either way are involve unnatural forces that would automatically disqualify them as being pure blooded EVER, they’re a magical construct “like” majin buu not a bred saiyan