The fact that we know the exact number of who belonged to the Companions was one hundred and thirteen indicates that if we were to take the proportions of the Aes Sedai as a whole, the vast majority of the male Aes Sedai were not among the Companions. So all we really know was that Lews Therin needed the strongest female Aes Sedai for his plan, but didn't necessarily need the strongest males. If we were to use some estimates with the amount of channelers during the Age of Legends being upwards of a few hundred thousand at least, it would indicate that the majority of the most powerful were most likely not members of the Companions. Especially since the Companions were noted as being young, so the older, more powerful and well trained male Aes Sedai were probably not represented in the group. Their relative youth actually would indicate the opposite - all things being equal, given their small number, most of them were probably not among the strongest in their peer groups because there just weren't enough compared to the overall population.