1. In my opinion there is no need to mention in the AOA of the Company that Mr. X is a nominee shareholder of the first subscriber.
2. An individual can be a nominee shareholder of the subscriber Company.
3. After the registration, the subscribers to the MOA and AOA are deemed to be the members of the Company. If Mr. X is a nominee of the Company then you will have to comply with the provisions of section 187C of the Companies Act, 1956 read with the Companies (Decalration of Beneficial Interest) Rules.
However, while filing Form 1A, one of the subscriber to the MOA i.e. Promoters of the Company should have a DSC which is to be affixed on the form seeking the name availability. This you should keep in mind while filling Form 1A.