After making the peak fictional fights like Sanji vs Queen and Zoro vs King, Toei animation has to make Gear 5 Luffy on a different level, a place where no will be able to achieve for years but they can not do this alone, therefore Toei Animation asked the king of animation who has been in this industry since 1923, yes you heared it right "Warner Bros" ,
Warner Bros are known for the unique animation style, the studio has a long legacy of making some of the greatest animation films including Loony Toon, Batman- Animated series, Superman-Animated series, Justice League which were a part of DC animated universe. Their expert collaborating in making anime will give a ton of knowledge and experience to anime industry.
Despite the veracity of these leaks is not confirmed yet but there a great anticipation in one piece fan base regarding the collaboration between Toei animation and Warner Bros. If rumors are correct then we could see some of the greatest anime episodes of this era.
While these claims should be taken with a grain of salt until official confirmation is provided, fans cannot help but envision the possibilities of combining the creative talents of animators from Toei and WB.