"Oh," Allura says sheepishly. "Oh no, that was just me." Shiro's eyes widen. "It...wasn't the shapeshifting?" "No," Allura says. "Just my normal level of strength." "Oh," Shiro says blankly. "Oh. Okay."

His arm wasn't the only thing the Galra changed. They also gave him certain... needs. Shiro learns to make it work for him.

"So it turns out that forming Voltron is a lot harder to accomplish when you’re not all about to die." Or where Lance engages in some dick centered problem solving. He and Keith struggle to form the oneness of mind they need for Voltron, so they try to work it out between themselves.