I don't understand the answer. Can the judge make his judgment and say the plaintiff wins?
In federal court, there is legal authority that a court MAY grant summary judgment to the non-moving party in the appropriate case (I know that, because I once urged a federal court to do just that). I'm not sure if there is similar authority in CA state court. But even in federal court, where a judge CAN do that, it is extremely unlikely in any given case. And it would be even less likely here, because in order to prevail, Defendants need only show that one required element of Plaintiff's case is lacking -- for instance, that the Prosper loans were not securities. If that were true, then Plaintiffs would lose. But in order to win the case (as opposed to Defendants' summary judgment motion), Plaintiffs would have to establish other elements of their case as well (that the securities were not registered, that Prosper sold them, etc.). Since those elements likely wouldn't be in play in Defendants' motion, no court is going to grant summary judgment to plaintiffs.
But that doesn't mean that Plaintiffs may not score a big victory nonetheless. If the Court rules that Prosper 1.0 loans are securities as a matter of law, that will be the end of that issue (at least until appeal). If the Court made that ruling, then the jury would be so instructed, and would not reconsider that issue. However, such a ruling might not be forthcoming, even if the Court denies Defendants' motion. The Court might just rule that there are disputed material facts regarding whether the loans were securities, and that a jury must resolve those disputed facts for a determination to be made. Thus, there are really three outcomes that could occur here. The Court could rule the loans WERE securities, the Court could rule that the loans were NOT securities, or the Court could rule that the facts are disputed and must be resolved at trial. (I haven't actually seen Defendants' motion, so I am just assuming that the (or one of the) grounds for the motion is that the loans were not securities).