However, one thing to keep in mind is that the crew only hunts devil fruit users, and Koby does not possess one. So, why did Blackbeard kidnap him?
Coby has a high level of control over his Kenbunshoku Haki. He first awakened this ability during the Summit War. With the help of Kenbunshoku Haki, Coby was able to hear the voices of the people around him fading away, which implied that people were dying.
Koby possesses the ability to use Busoshoku Haki.
Coby is one of the most talented characters in the series. Just two years prior, he was merely a kid with below-average strength. Now, however, he is a marine rear-admiral and a pretty strong one as that. He's strong, but not strong enough to be Luffy's match.
During the Whitebeard War, Coby awakened an ability known as Observation Haki. Coby was shown hunched over and crying on the battlefield, saying the voices in his head were disappearing one by one as the combatants around him were slain, much like what Aisa felt during the Skypiea Arc.
Thanks to his training under Garp, Koby seems to have mastered all the Six Powers, which makes him quite a formidable enemy for any pirate right now.
Thanks to his training under Garp, Koby seems to have mastered all the Six Powers, which makes him quite a formidable enemy for any pirate right now.
He eventually joined the Marines in the hopes of becoming a strong soldier, and went to train under Garp and rise to the rank of Captain. He has a long way to go before he can fight against the likes of Luffy, Law, or any of the others. With his current progress, he will never surpass Garp.
7/10 Won't Unlock: Coby
However, Coby works under evil officials and does the bidding of the celestial dragons to a certain extent, just like all other Marines. It's no wonder that the Marines don't usually have conqueror's haki, and just like everyone else, it is highly unlikely for Coby to awaken conqueror's haki.
Colby has eaten the Kuro Kuro no Mi, a Logia type Devil Fruit which allows him to create, control and become shadow at will.
There are rumors that Koby is going to fight against Boa Hancock, but it is very obvious that he's not ready for such a challenge. Smoker is above Koby in every aspect.
At bare minimum, Hancock would have to actually fight Coby. He's strong willed enough to not get knocked out by Conquerors Haki and focused enough to resist her devil fruit.
Dragon is almost certainly going to be a user of Conqueror's Haki as well just like his son. In Marineford, Luffy's Conqueror's Haki was attributed to Monkey D. Dragon, meaning he is already implied to be its user despite not having used it so far. In the future, fans will certainly see him make use of this ability.
Silvers Rayleigh is Luffy's uncle.
2/10 CAN'T BEAT: Rob Lucci
Lucci is also trained in Rokushiki. Since being defeated by Luffy, Rob Lucci joined the CP-0 and improved his fighting skills. For the time being, Lucci holds the edge over Koby, but it might not last for long.
8/10 Can: Marco
During the Summit War, Marco clashed against all three of the Admirals on an equal footing. He managed to hurt two of the three, showing that he's indeed capable of fighting and possibly even beating them.
Garp is easily the most powerful Vice Admiral in the Marines, and rivals or exceeds the power of the known Admirals and Fleet Admirals. After then-Admiral and future Fleet Admiral Sakazuki (also known as Akainu) killed Ace, Fleet Admiral Sengoku held Garp down to prevent him from killing Sakazuki in revenge.
Kizaru is likely One Piece's weakest Admiral seen thus far. Despite having the strongest Fruit on paper of the five Admirals seen, he never utilizes it to its fullest potential. While still an Admiral and therefore incredibly strong, he's most definitely the weakest of the bunch.
In all likelihood, Zoro is already at commander level; whilst Coby is only a rear admiral. He is a few years too early to stand on the same battlefield as Zoro.
Garp doesn't use Devil Fruit powers, making him a completely Haki based fighter. Although he may not be able to defeat him as he is now, in his prime, Garp would certainly prove to be more than a challenge for Kaido.
It is pretty obvious that when Doflamingo could not stand up to the power of Gear 4th Luffy, there's no chance of him surpassing someone like Garp in terms of strength.
CKz.. correct, so obviously zoro cant do skywalk like sanji. I still think Zoro needed a boost for his attack against Pica. Zoro was using his feet to walk in the air but not Skywalk.
Conversation. Something interesting to note, all CP9 members are said to have observation and armament haki. Lucci was stated to have learnt it over the timeskip to get into CP0, so while they're not directly listed as such yet, this implies that all CP9 members made it into CP0!
When using Gear 4, Monkey D. Luffy is capable of jumping off the air, akin to Geppo, by utilizing the extreme compression of his rubbery body.