I do not wish to start a debate on Baba Banda Singh Bahadur's so-called "flaws" - I just wanted to draw the sangat's attention to the following paragraph on Britannica.com:
'Although Banda is greatly admired by Sikhs for his bravery and his loyalty to the 10th Guru, he has never commanded the complete approval of the Panth. This is presumably because he introduced changes to the Khalsa, including a new greeting, “Fateh darshan” (“Facing victory!”), in place of the traditional “Fateh Vahi Guruji” (“Victory to the Guru!”). He also required his followers to be vegetarians and to wear red garments instead of the traditional blue. Those who accepted these changes were called Bandai Sikhs, while those opposed to them—led by Mata Sundari, one of Guru Gobind Singh's widows—called themselves the Tat Khalsa (the “True” Khalsa or “Pure” Khalsa), which should not be confused with the Tat Khalsa segment of the Singh Sabha, discussed below.'
(Taken from [
www.britannica.com])