I am going to quote both our responses from the beginning of this particular issue, so as to keep the subject on track and not lose it to a rabbit trail that becomes argument, before I address it.
I simply said saying God "can" do something does not make something else a false premise. So the question does not address the original statement: "But if God does not ordain all things something happens outside His sovereignty." and is still operating on what He "can" do as a premise instead of what He did do.
For the premise of all things to come, ever, and in this discussion, go back to Gen 1:1. That is the premise of interpretation of all the Bible. "In the beginning God-----" With the correct understanding, as far as is possible, by what He reveals of Himself, we arrive at a God centered view instead of a man centered view. And how interpretations more likely to be accurate, instead of "can do's", "could have's", "maybe's", etc. Or what we imagine about God.
The beginning of what? The creation of our world and all that is in it. It was not the beginning of God. It was God beginning some - thing, and for His purpose. All of which He knew and purposed before He created this world, in full and in detail, not because He looked into the future, but because He ordained it. It is His plan and His purpose. The very first thing He created was space and time---boundaries for all that would be put in it. Every bit of it subject to Him, none of it circumstance or happenstance but for His purpose. None of it unknown, none of it reactionary, but fully conceived and known by Him, down to every speck of sand and where it lay. For His purpose.
He planted a Garden, setting the boundaries for Adam and Eve, giving them work and giving them commands. And we see man's place in it. He intentionally created them as mortals (able to die) and as corruptible (able to be corrupted) but not corrupt. They had a will that could make choices (part of His image they bore) but it was never free, for it was never free of His will. They were commanded and obligated to trust and obey their Creator. Thus the ability to sin, which they did. Were put out of their boundaries where they tabernacled with God, and all of creation became subject to death.
That was not the creation of evil, and I posit evil is not a creation but the absence of good.
In any case, this was God's intent in creating our world and putting us in it. And the only why of all this is the end result that He gives us. A new heaven and a new earth, that already exist in God's economy, it is only us who travel to it through the perspective of time. This new heaven and new earth existed in God---for nothing exists outside of Him---before the creation of our world and God has always been working towards that through our creation. You might very well say, to put it in human terms, that this aspect of creation is only the first stage of what God is doing. The goal of His purpose is a new creation, first from within humanity, through and in Christ, and ultimately in a creation in which sin, death, evil, no longer exist. Christ destroys them---forever. IOW a creation and creature (s) who are then immortal and incorruptible. A new creation in Christ. By Him, through Him, for Him.
Not a single thing is dependant on the actions of men apart from God, because none of the actions of men are apart from God.