Speculation 2: The real Uchihiro Shoko Asahara (because the real spot may be dead. Shore's spot is fake, and Shore's spot may be a water stop, because the other eye may be hidden. And the water stop hairstyle is very similar to Xiao Zhi's spot)
Guess 3: Ootutuki Hagoromo (Because ten tail was really sealed by Ootutuki Hagoromo, all Ninjutsu was founded by Ootutuki Hagoromo with a round eye. He is the strongest in the ninja world. If Dou resurrects Liu Dao, Dou can control Liu Dao at will, and Spot is afraid that his plan will be destroyed by Dou Dao at any time.
The above is from Baidu Encyclopedia
There is also an unofficial guess: his younger brother Uchiha Izuna.
I don't think it can be between columns. He saw how peaceful the cells were among the columns. If it's really between columns, maybe Diandian wants to fight him again. After all, he lost the first time.
I've been struggling for a long time, too
I also want to know who that is.