Blackbeard feed from Akainu before the skip, and since we haven't seen the current versions of them I'll go with Akainu
Blackbeard still has a chance~
Devil fruit powers don't work on him lol his yami yami is like built in haki. He took flames to the face and suffered no burns his darkness simply absorbed it. He took a quake to the face and shockwaves from sengoku which had no effect.
Granted I could still see akainu winning without use of his powers via haki since his was strong enough to pierce through whitebeard's~