Mugiwaras will have as many conquerors as Rocks crew had.
While Rocks' ship sinked, Mugiwara will succeed.
Rocks' crew CoC users:
1)Rocks D. Xebec (even tho it's not confirmed I consider it given)
2) Whitebeard
3) Big Mom
4) Kaidou
Potential CoC users:
5) Shiki
6) Captain John
Mugiwara's crew CoC users:
1) Monkey D. Luffy
2) Roronoa Zoro
Potential CoC users:
3) Yamato (if she joins)
4) Usopp
5) Sanji
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Honestly I wouldn't count Shiki and Captain John, they're barely relevant for the story and I think that we will never get any information about them.
So I will assume that Rocks members had only 4 CoC users.
So if Yamato joins and Usopp unlocks CoC, who honestly has a better build-up than Sanji, there is only one chance for Sanji to unlock CoC too and that is the route B.
Route A:
No° of Coc User in Mugiwara's crew = No° of CoC User in Rocks' crew (Luffy succeded where Rocks failed despite having the same number of CoC working under him)
Route B:
No° of CoC User in Mugiwara's crew = No° of CoC User in Rocks's crew + 1 (this is to further even more the point that Luffy has been successful despite having even more conquerors working under him)
If you ask me if I was Oda I would go for Route A, I don't like Sanji and I genuinely think that he doesn't deserve CoC character wise
But that doesn't stop me to analyze all the possible outcomes in an unbiased manner and I admit that Sanji still have some chances