Most of them not even close. You really think Sanji reaches the level of Kaido, the world's strongest creature and strongest pirate (until his defeat against Luffy)? Kidd became irrelevant. He was one shotted by Shanks and lost his Poneglyphs. How is he coming back Kaido level? Same for Law, who was trashed by Blackbeard.
Law was trashed by Doflamingo too two arcs ago, now look at him, he actually put a good fight against Blackbeard, he can trash Doflamingo now too. Until the final war we probably have 3-5arcs, that is enough for Law and co to climb the mid-high top tier range.
And you dodge Zoro arguments, I ask you again this one:
"I mean Zoro is the best example which we need to know for the powerscaling answer.
If he face a Gorosei after his Mihawk battle, you can be damn sure that the Gorosei are at least Yonkou lvl. But if he face a Gorosei first and then Mihawk, the opposite would be the case and I would agree with you."
Sanji in fishmen island wouldn´t be even a match for Queen, 3 arcs later he defeated such a opponent...
These five have potential to became monsters.
Best example Zoro.