there can only be one necessary existent

[Eesharebba]

If he is a man because he is Amr, then humanity does not exist in anyone else, and if he is a man because of a general nature, then he is composed of two natures, a general one and a special one and the compound is an effect; but the necessary existent has no cause, and therefore the necessary existent is unique. And when Avicenna’s statement is given in this form it is true.

But here's where some issues exist.

Why do two realities have to be separate?

For example, if I say, there is a lake, and there is a river, and there is an ocean,

Sure, they can be separate entities, or they can be connected in various ways. Here, we aren't even taking a look at this.

If Amr is a man because he is Amr, it means in the "pool of water" which is Amr's reality, he is a man. However, what if there is a larger "pool of water" which connects Amr to mankind, but not to animalkind, in such a manner?

Blessings,if amr is a man because of a shared general nature to mankind,and there were other men with a generalized nature of mankind,he and the others would be composite(being of a generalized man nature and a specific nature that differentiates him/them from other men)he would thus be a effect,dependant,finite and limited and also temporal.

the unique necessary being,can not be composite or he is an effect of two parts,and he is dependant on those parts,and thus not unconditioned.

Why do two realities have to be separate?

Multiplicity by definition means differentiation and seperation,two neccessary beings would have a specific differentiating point of subjectivity,awareness or personhood(Allaah is not a person and doesn't and cannot have quiddity but I am taking the polytheist or trinitarian view in mind here)on top of a shared general nature of 'neccessariness'or 'divinity'which is impossible and makes them all metaphysically composite effects and thus creations.

they would not be 'neccessary beings'but effects,but if Allaah is divine due to his specific nature alone,none can share in his divinity,he has one nature metaphysically(no parts),and is absolutely one and unique in his mode of being.

The Qu'raan says allah is A7ad,which in arabic means a absolute oneness and unicity,he has no physical or metaphysical parts,or even different attributes which differentiate him internally,or in his mode of being,putting those things in parts,and thus making him restricted,limited and thus finite.

'two neccessary beings'would mean as Avicenna accurately said ,interdependance,which is impossible,as it means they are composed of existance and non-existance,being of two mutually incompatible,contrary natures at the same time in the same respect,which is a contradiction logically and in the basic law of identity.

this is asserting basically square-circles.