Never said that Sanji receive same growth as Luffy, I make it clear that Luffy get a better grow overall.
The point overall is that Sanji became far stronger then his version from DR and Oda will show it against Queen.
Zoro is special and probably only grow little, he come out of the ts stronger then Doffy ever could dream off to be(or are you one of the snowflake who believe that DR Zoro would lose to Doffy, or better that Doffy could match Wano Zoro)?
Overall Cracker show us perfectly how easily a G2/G3 Luffy was overpowered and need rapidly his G4.
Now Sanji facing a stronger character then Cracker, do you wanna tell me a Luffy who quickly was overwhelmed is stronger then a Sanji who fight now a stronger character then Cracker?
Wci Luffy pre Katakuri>Doflamingo, the same Luffy was overpowered quickly by Cracker:
Nami who know and see Doflamingo power, seeing how Law(injuried) and Sanji get beaten, screaming here to Luffy who beat Doffy to run away from Cracker who overpowered G2/G3 Luffy(who match Doffy) quickly. More powerbased info can´t be reveal as Oda show here, Sanji facing now someone who stands above Cracker. He "must" be stronger now, a character who get quickly beat up by Doffy not facing someone like Queen without getting far stronger.
Even if Sanji get help, alone the fact that he can face someone as Queen is enough to say that he improve a lot.
Otherwise he would get beaten down by Queen very quickly as what happen to Wci Luffy(G2/G3) who should be above Base Doffy