The only mangaka I can think of who openly said he was inspired by oda is hori. Even then, one piece isnβt really a series you can just replicate, and Iβd say the same for hxh.
Naruto and bleach,helped popularize a much easier battle shonen formula to imitate like the small main cast, the mentor/sensei figure, the inner demon or hidden power, rival dynamics, exams/training arcs, etc.
So a lot more people gonna follow the easy blue print
Does anyone find it odd how you rarely see any mangaka who say One Piece as an inspiration?