[E. Pluribus Unum]

“If” is not a supposition.

“Suppose” is a supposition.

“If” presents two or more equally likely alternatives.

[af_vet_1981]

What's the difference between an assumption and a supposition — both nouns that are often taken as synonyms for each other? An assumption is an idea or theory that is usually made without proof. A supposition, on the other hand, has the connotation that the idea or theory is testable and provable. If you are to meet someone named Hunter, you may make the assumption that you are meeting a man. But if you know that Hunter lives in an all-female dorm, you may have the supposition that Hunter is a woman.

You wrote "If it is, Cruz is going to be the new owner of National Enquirer.

Are you indicating it is not provable and therefore you are making an assumption ? It is certainly not an observation, as you claimed. There are two parts to your sentence, and both are theoretically testable and provable. Neither is an observation or fact.