"I have to get stronger. They were hurt because I wasn't strong enough."

Zoro kept muttering as he trained relentlessly, even with fresh wounds opening up and bleeding; he still kept going. All while blaming himself for not being strong after having a rough fight.

He was scared that the crew wouldn't want him anymore if he didn't become the strongest.

"... What if I won't become the world's greatest swordsman?" Zoro spoke, suddenly turning to you, fear evident in his eye.