No pun intended regarding todays manga release, but what Chinjao said pretty much did hit the nail on the head with what he said.
So basically Oda just said, "I bet this is what my fans are thinking right now."
Yup I am. If Luffy is struggling with him, how can he hope to defeat the elite? Especially considering the enemies he has yet to face in such short time. Theres not really time for him to train anymore.