if it's true,kaido will rise in my esteem and things will become much more interesting
Exactly, not only that, he is planning on looking for the Ancient Weapons with BM if true and it also makes sense why he's been "soft" the last 20 years or so.
It also helps tie the plot better than anything else. I personally can't see this being someone's fake leak, this all sounds way too much like Oda's writing, right down to wasting panel time on fodder thinking about Momo and Kaido's plan and their reactions.
Seriously guys, THATS why its believable. The chapter spends time on fodder dialogue, Oda's favorite lmao.
Other than that, the chapter also seemingly suggests that there was another person with Marco, Neko and Izo. I personally want this to be real.