Al-Adel, writing about the events years later, acknowledged that he also was leery of Zarqawi, a man who already had a reputation for being stubborn and combative.
In any organization, whether it be the largest online retailer in the country, or Global Islamic Jihad, people skills are important. Someone who considers himself somehow separate and above his coworkers really cannot be tolerated.
You want someone who is committed to the goals of the organization, but who also just views it as a job, and doesn't let the daily stresses get to him (or her). At the end of the day, even if everyone else isn't faithful enough, they are advancing the cause, and there is time to gloat when you're the only martyr to get the 72 virgins.
Do the lesser, flawed martyrs get a smaller number of virgins? Maybe 12 virgins, four of whom were immodest with their ankles, and one who regularly gave blowjobs on the third date.