ZD, I don’t get your point. We can have Torah society without a Sanhedrin, we just can’t carry out punishments.
If we had a Sanhedrin, it wouldn’t be up to R’ Shteinman and Chacham Ovadiah, it would be up to the Sanhedrin (they would both likely be members)
So what would be the halachas?
How is someone supposed to know them if 2 Gedolim disagree on them
A sanhedrin would solve that problem since they would be the final arbitor of Halacha