Or you could assume that Plato left out some questions that went nowhere for the sake of brevity and only wrote the lines of questioning that mattered. And yes, that can look exactly like starting with the conclusion.
One example is the Pythagorean theorem. Socrates - the fictional character in Plato - claims that he can prove that someone already knows something, even if they don't know they know it. Plato writes in a regular dude, some kind of uneducated laborer who's passing by. Socrates starts up a conversation, walking the passerby through the steps of a geometric proof of the Pythagorean theorem, by means of questions and answers. The conclusion to Plato's story is that not only is the Pythagorean theorem true, but the passerby knew it was true all along, if they ever thought it through.
At no point is there a debate between peers, where one person is advancing an argument - evidence, reasoning, conclusion - and the other is looking to rebut that argument with evidence, reasoning, and conclusion of their own.
My thesis is that while the SM may look good on paper for teaching Geometry Facts to Children, it's a mistake to introduce it into a reasoned debate between peers. There are two main reasons I think it's a mistake. The first is that it's condescending. The second is because it excuses your own conclusions from critical examination and rebuttal.
You think you have a solid rebuttal to the other person's claim. Instead of laying out your rebuttal for examination - evidence, reasoning, conclusion, you assume your conclusion is true, and then try to get the other person to answer your leading questions until they arrive at your conclusion. ]
Any rebuttal that can be expressed on the form of leading questions can be much more quickly, clearly, and honestly expressed as a series of concrete statements. Hiding those statements as unstated assumptions behind leading questions is a technique for avoiding honest debate.