Zoro would not be as strong as he is right now if he got Luffy type of training. Luffy if he got proffessional training like Coby, Zoro, Sanji etc would be Yonko level right now.
For Example, Take child Zoro at age 4, give him swords, throw him in the jungle and tell him to survive. This Zoro would never be as strong as he was pre time skip Zoro that he trained at the dojo.
Then during the timeskip, have Garp teach Zoro haki, and then leave him to fight the Rusoskaina Animals, and figure it out on his own.
During those times above, have Zoro never lift wieghts, only survival and haki training,like luffy had until Wano.
The Zoro above would never be as strong as the Zoro we have now in the story.
That is exactly what Luffy is. Luffy never had any proffesional training.