I need to bring this theory I have to light. When people mention Blackbeard being able to house two devil fruit powers, they say things like "he can't sleep" or "he has multiple personalities". Their are many issues with these theories including how Blackbeard has no sign whatsoever indicating he has more then one personality. But how is Blackbeard able to house more then one devil fruit? It's to obvious. It's not Blackbeard who can do so, but the yami yami no mi. He mentions so many times that his devil fruit has dominance over other fruits, which is proof alone on how he can house two at a time. If the yami yami no mi can control other fruits, then theirs no point in the two fighting, therefore leaving Blackbeard safe. Also notice how Blackbeard wasn't surprised at all when he was able to absorb and use Whitebeards power. Obviously he knew that the fruit can do this, which is probably why he was so intent on getting it from Thatch in the first place.
Place your opinions on the matter below so I can debunk them.
Now, think about Haki on this one! Just because Ace has the mera-mera doesn't mean he's immune to armament Haki! So I think Luffy could beat Ace after the time skip. Assuming that Whitebeard and Big Mom's generals are around the same strength, Luffy beat Cracker (the fight with Katakuri wasn't dependent on strength alone), meaning he's on par with the Yonko's commanders. And you may say that Ace is a logia, but you know how well Armament Haki does against Logia-type users. So I think luffy would have a good, long battle and come out victorious.
You know like added into promotional material, openings, and just alongside the other straw hats in general. I know that wikipedia officially labels him as a straw hat.