Nobody cares about him erasing aura, its a fodder ability. Well, if it the fruit's awakening can do something like erase wounds or something, then I will change my opinion.
Honestly, I dont care about his fruit atm. If Shiryu has top notch haki, his fruit doesnt matter. We already know most abilities are useless in front of haki.
Apples and oranges, Greeneggs. You are not making much sense.