I think it doesn't changes much. Al Qaeda operates in pretty independent cells. A central leadership just gives a name for the Western powers to witch hunt.
Originally Posted by Gorgod
And besides, Osama Bin Laden has established Al Qaida moderately well, at this point, how much does charisma matter?
A charismatic leader can attract new followers and inspire loyalty. It's a vital quality for anyone aspiring leadership. Or else it wouldn't be a stat in 9 in 10 RPGs.