such as可以单独用作代词吗？

If they who believe in Stricklands greatness are right, the personal narratives of such as knew him in the flesh can hardly be superfluous.

请教老师：这里的such as 是整个用作代词作介词of的主语吗？麻烦老师解说一下这种such as的使用方法，谢谢！

such在此为代词，作介词of的宾语。as引导比较分句修饰such. 传统语法觉得as为关系代词，引导定语从句修饰such，as在从句中作主语。