Oden is a mix of both, Zoro and Luffy. Oden has a personality similar to Luffy's personality and has a fighting style similar to Zoro's fighting style. But Zoro's parallels with Oden are more similar in terms of situations.
Nope, Luffy parallels Oden in terms of situations. Oden going through trials by Whitebeard is similar to Luffy's childhood as well.
Roger and Shanks are also Swordsman, so the Zoro parallel does not work.
Luffy has to survive the dangerous wilderness becoms Ace's friend
Chapters 581- 589
Luffy was born strong. Luffy had been coasting on his natural physical strength in base.
If you go back and read chapter 1, you will see Luffy only spent time working on his devil fruit control since he was a kid.
Also read from chapter 581-589.
He never lifted weights until Wano.
He left Dawn Island in the East Blue the weakest sea in the world, stronger than Enel, Arlong and Crocodile -a Warlord of the sea.
He was warlord level in the east blue. Not inly that, but he Mid-Diffed Arlong in the manga, a pirate from the grandline.
All he did with the logia was touch them.
Look at what Luffy dealing with at the age of 7.
He even went a week in the wild all by himself
https://www.mangapanda.com/one-piece/581
https://www.mangapanda.com/one-piece/582
https://www.mangapanda.com/one-piece/583
https://www.mangapanda.com/one-piece/584