Merriam-Webster is not a legal dictionary. Once again you are using vernacular and mistaking it for a legal term.
I looked up 'hypothesis' (and related variations) on the first six Legal Dictionaries that came up on Google search. None - [ETA] bar one which gives an example of its use in a trial court - define it as a legal term.
One gives a common dictionary definition of, 'Unproven theory'.
As a law court deals with facts - ipso facto proven - then it would be an oxymoron for a supreme court judge to promulgate 'unproven facts'.
Bearing in mind that a key function of a merits trial is to determine the facts. The Supreme Court is no longer at trial stage.
Its Section 9 are the facts, as set out by Marasca. Section 10 is a reiteration of the verdict, as set out at the start.
Where does that leave you and your Merriam-Webster dictionary?
Continuing to find your posts full of absurdities.
Too bad you didn't list quotes from your legal dictionary sources.
Here's some information:
"Hypothesis
An assumption or theory.
During a criminal trial, a hypothesis is a theory set forth by either the prosecution or the defense for the purpose of explaining the facts in evidence. It also serves to set up a ground for an inference of guilt or innocence, or a showing of the most probable motive for a criminal offense."
Source: http://legal-dictionary.thefreedictionary.com/hypothesis
"What is HYPOTHESIS?
A supposition, assumption, or theory; a theory set up by the prosecution,on a criminal trial, or by the defense, as an explanation of the facts in evidence,and a ground for inferring guilt or innocence, as the case may be, or as indicating a probable or possible motive for the crime."
Law Dictionary: What is HYPOTHESIS? definition of HYPOTHESIS (Black's Law Dictionary)
Source: helawdictionary.org/hypothesis/
Another absurdity - wonderfully entertaining - in your post is your implication that a word used by a court must necessarily be a "legal" term. If that were true, words such as "and", "the", and "but" would need to be "legally" defined. Courts use the language of their country - and the format of a judgment (motivation report) is specified in CPP Article 546; there is no statement in that procedural law that only "legal" terminology must be used.
And yet another absurdity in your post is that a court may only write of "facts". Of course, this is not true; a court could, for example, prove a hypothesis through contradiction.