Ben and Yamamoto share a very uneasy relationship. Initially, Yamamoto doubted that Ben could turn the Arrancar, let alone the Espada, against Aizen, but when he sees that Ben has actually done so, he granted Ben extra power by letting him absorb his flames while Ben is Heatblast, seeing that Professor Paradox was not lying. However, when Yamamoto kills Wonderweiss, a horrified and angry Ben asks if there was any other way to save him, and when Yamamoto says there was no other way, Ben angrily asks if he just choice the easy way out. Realizing their differing ideals about the Arrancar, Yammamoto wonders if he and "...[Ben] really ... work together." After Ben defeats Aizen, one of his main demands is that the Arrancar are left alone, and when Gin is about to be punished for his betrayal, Ben calls Yamamoto stupid, saying that he had no right in deciding others fate even if he was more powerful, angering him further.