Confusing Duality of Management: Private Company Directors vs. Shadow Directors

Yaar, koi bataayega ki difference Private Directors and Shadow Director ka kya hai. Notes mein likha hai ki shadow director ka concept only section 299 of Companies Act 2013 mein hai. Lekin jab maine 1st year ke notes dekhe toh usmein iske bina Private Directors ka concept bhi aaya tha. Mera problem yeh hai ki ab maine koii case law nahi dekha jismein yeh duality of management ka concept kaafi clear hota hai. Kya Private Directors ko shadow directors ke under hi consider kiya jaata hai? Ya phir yeh do concepts alag-alag hai aur Private Directors ke liye koi alag definition aur powers hoti hain?

Please help, samajh nahi aaya...