I agree, it would be logical, but I think they'll just hint at It like in the manga.
I mean, there were plenty of hints in the manga too, from the bowl to Kizaru changing position, form the "..." to Kizaru thinking of Bonney and Sentomaru. Much more than any alternative, usually totally imaginary (like VA, who wasn't even confirmed to be there at the time).
Here It was full of deniers, but even before Oda said It, It was quite clear It was Kizaru. I fear anime will only keep that way: heavily hinted but not confirmed.
What a nice guy. Full treatment.