Oh lol didn't see this till now sorry. Haki would not effect Black Star. Black Star is just as fast as him if not faster because of speed star or severed shadow technique or just physical attributes.
" @YouFinished: hes faster stronger and has haki but either way pre time skip luffy could beat him as well black star doesnt have enough speed to match him
@Haofan123: technically speaking yes i bet he could but that doesnt sound fair "