focus on .....as结构

Many theories focus either on the individual or on society as major contributing influence.请问这里的as major contributing influence.是作宾补吗？还是修饰前面名词的定语？

as介词短语并非单纯修饰名词，而是与动词focus有关。所以应该剖析为与宾语有关的状语。focus on Aas B 把A当作B而予以关注。

focus either on A or on B as C 要么把A当作C，要么把B当作C而予以关注。

Many theories focus either on the individual or on society as major contributing influence.

= Many theories focus either on the individual as major contributing influence.or on society as major contributing influence.