I'm not just trying to brag, but this is just to prove my point.
Offensive provides a much quicker start.
To get back on topic.
All tribes need good leadership, because without proper direction, some players will lose faith in their leader and possibly their tribe. As someone said earlier, i usually don't join a tribe until i am a week in. This gives me the opportunity to show my growth and control of my area early on. Also by that point, i can usually judge which tribes i should join and which i should avoid. This world i chose iHate (as it was back then), and i will stick with them until i leave this world. This is my personal way of playing.
I think mass recruiting can have its advantages, as long as leadership is willing to cut people off when they do not play well. If you recruit anyone at first, then vet your players later, you would think that that gives you a more solid base of players. This is how most tribes operate, they get the users, then train them. The difference between these tribes and the so called "elite" tribes is that we vet our players before they join. This is probably why we end up with so few players, and is not a result of the tribe saying "no more than 20 tribe members!", its a result of selective recruitment.
With the above in mind, if there were 60 great players in a K, or even 120 great players across all four Ks. There is no reason why good leadership cannot take them to rule the world. Unfortunately, great leaders, willing leaders are not always available or willing to do any of what i just mentioned.