Does the text suggest that using logic and argumentation is a valid path to understanding Sai Baba's greatness?

No, the text from Chapter 2 explicitly warns against using argumentation and logic as a means to spiritual understanding. Sai Baba is quoted as saying, 'Where there is a mind for argumentation, there is abundance of ignorance and Maya.' The passage goes on to state that such a person is not fit for self-knowledge and will only find unhappiness. The author himself admits to having had a 'bad intellect and a logic-driven mind' and being 'prone to argumentation,' presenting these qualities as obstacles to be overcome. Chapter 2 clearly advises against engaging in dualistic explanations, refuting others, or establishing one's own side, calling it a 'useless effort' that distracts from the true path of faith and devotion.