As we all know, Phoenix Marco is present Wano and take part in the battle against Yonko Kaido. It can be said that in the current Luffy alliance, Marco is the name with the greatest ability and strength. It is not Luffy or other Supernovas but Marco who is capable of hand-to-hand with 2 Yonko Big Mom and Kaido. It was Big Mom who acknowledged and somewhat didn’t want to waste time with Marco when she met the former captain of the 1st division of the Whitebeard Pirates.
In terms of Devil Fruit strength, Marco already owns a mythical Zoan-type Devil Fruit that can help him transform into a Phoenix with blue flames surrounding. If we talk about healing and self-healing, if Marco gets number two, nobody dares to accept number one.
In terms of Marco’s fighting strength, he is one of the strongest characters in One Piece. Marco was able to match all three Admirals at the Battle of Marineford. Phoenix was very confident to confront Admiral Kizaru, Aokiji and stopped Akainu’s attack when the admiral aimed at Luffy. In fact, after Whitebeard died, Marco became the new leader of the crew. And if there is the intention to become a Yonko, with the remnants of the Whitebeard Pirates still full of captains, Phuong Hoang is strong enough to rise to become a Yonko. However, he did not do this.
If we remember that the Five Elders mentioned Phoenix Marco as one of the few who was able to stop Blackbeard Emperor. His name is given separately from the rest of the Whitebeard Pirates, so he is personally known to be a man of great interest to both the World Government and other Pirates.
Saying that so we know that his strength or fame in the Whitebeard Pirates is very high, it is possible to turn himself into a Yonko. But the “pineapple head” guy doesn’t want to do that.
The most important thing Marco did after Whitebeard’s death was to avenge his Old Dad. After failing to achieve that goal, Marco decided to disband the Whitebeard Pirates and let each member of the crew choose their own path. As for Marco’s individual, he chose to go to an island, living in hiding as a doctor. Apparently, without Luffy’s suggestion, Marco wouldn’t care so much because his ambitions were now lost from the remnants of Whitebeard to losing to Blackbeard and disbanding.
Currently, Marco has yet to show much of his ability at the Wano arc outside of a gentle interaction with Big Mom. However this may end in chapters until One Piece 997 shows Marco has reached Zoro and Robin’s group. Zoro expressed his wish to help Luffy slash Kaido and the treatment of two people in the way, the Fire King and the Plague Queen, could be handed over to Marco. Many spectators were waiting for the match between Lizard Bay King Hoa Hoan and Phoenix Fire Phoenix. And in the next chapters, given the current state of affairs this is very likely to happen.
In general, Phoenix is fully qualified to become Yonko. However perhaps Marco He has no desire and desire for this position, what he wants to do the most right now is to help Luffy defeat Kaido, free the Kingdom of Wano.