Shanks is stronger than Black Beard (One Piece)

Thank you Con. I will now rebut to your arguments.============================================================================#1. Blackbeard is as strong as Whitebeard... at leastRebuttal 1: First, I think it's important to note that it takes YEARS to master one's devil fruit ability. Of course, some fruits are better than others at combat (most logia are great for combat), and to use some fruits, it takes a bit of thinking (Gomu Gomu no mi, for example, isn't that great for just straight up combat, but can be used to fight). The thing is that, Blackbeard has only had 2 years with his Devil Fruit, and I don't believe that that is enough time to master his devil fruit powers. Let me go into some detail.Luffy has had his devil fruit for many years (at least 10) to get to where he is today. Now, I do understand (like I stated earlier), that the Gomu Gomu no mi is not the most dangerous devil fruit out thee, but still, it's a good example. Another good example would be Ace's Devil Fruit, the Mera Mera no mi. Ace was strong and all, but at the end of the day, he lacked the asthetic of other logia users. For example, he couldn't travel as his own element (which is something crocodile could do). Even he hadn't mastered his devil fruit to the fullest extent.Whitebeard, we can assume safely, has had his devil fruit for years, and has mastered it to a great extent. Blackbeard has had it for such a small amount of time, there is no way he is as good as Whitebeard at controlling the Guru Guru no mi. Simply having a devil fruit is not the same as being able to use it to a great extent. Sometimes, users with a weak devil fruit beat users with a strong devil fruit because of their training.#2. Blackbeard's Strength is UnknownRebuttal 1: Shanks's power is unkonwn as well. For all we know, he could have obtained some strong devil fruit. I believe, that we should just be going off of what we do know.#3. What we do knowRebuttal 1: And with all of the crazy powers that he has, tilting seas, nullifying devil fruit powers, trying to sink Marineford, and all of the other crazy stuff, he still isn't ready to fight Shanks. He admits it himself. If admittance itself isn't proof enough that Shanks is stronger than Blackbeard, than I don't know what is.Rebuttal 2: Furthermore, going back to the 2nd contention my opponent made, why exactly is Blackbeard going Devil Fruit hunting to get more powers? It's understood that he wants to be more powerful, but if he really is the strongest man in the world, than why bother? The only reason for him hunting more devil fruits is because he doesn't feel that his power is strong enough. The main reason, I believe, that Blackbeard went devil fruit hunting was to make sure that he could have enough power to beat Shanks. Especially because that seems to be his only competitor.#4. Blackbeard is a YonkoReubttal 1: It's understable that he is a yonko, but honestly, Blackbeard killed Whitebeard after Whitebeard was already VERY injured. I think he's powerful enough to be a yonko, but I don't think that's enough justification to say that he is the same level.Rebuttal 2: It is also stated by the gorosei that Shanks is one of the few that is capable of defeating Blackbeard.