Fannin attended West Point for one year and I think he got kicked out. At any rate he didn't learn much. LIke most of the other leaders and much like Travis he was real ambitious and a glory hound so leaving his command or submitting to Houston's authority would win him the kind of plaudits guys like Wharton get: a small town named after him. He sought greater glory and stayed with his command, which was at the front of an undisciplined mob. He could not have entered the Alamo anyway because of the Mexican cavalry.