Okay. I think Jaunes semblance has a much bigger role and importance than we all think. Jaune has the ability to transfer his Aura to another person. By doing so, he restores their Aura and makes it stronger and by amplifying their Aura he is making them more powerful. We saw that after Jaune restored Weiss' Aura, she herself said she felt "much" better, meaning she felt more powerful than before. Which she obviously was seeing how she summoned the Lancer Queen spirit.
I think Jaune has like a Paladins ability. They are the noblest and most heroic of warriors. They have the strongest healing powers and they are the warriors that evil fears the most. Because Paladins contain the purest light. They also inspire hope in people, which is what Salem fears. Someone with an ability like a Paladin, could spell MAJOR trouble for Salem.
Remember that it was the Warrior King of Vale that stopped the Great War. His Aura was so powerful, that the other three kingdoms knew he couldn't be beaten and were ready to kneel before him. If Jaune really is a descendant of the Warrior King, he could have inherited his ancestors power. And he could posses the exact same Aura power. Making him just as dangerous.
Jaune making others more powerful gives them a huge edge over their enemies. He could make Ruby so fast that she has the speed of Flash, he could enhance Yang so much that simply flicking her with your finger could giver her the strength to cause a massive earthquake with a single punch, Ren could hide the emotions of a whole city, Nora would be able to absorb electricity from a distance, Weiss could summon an army of spirits, you get the point.
Look at this way, in many fantasy games I've played, I've found that the best way to defeat my enemies was to take out the healers first. That way, once the enemy is down they would have no one to come and restore their strength so they could keep fighting and I could focus on the main target or objective. Once the enemy is down, their down.
I think Jaune has just became the best chance of all the heroes coming out of every battle alive. he has become the teams best hope of surviving every battle. I think Jaunes semblance also makes him a big target and threat. If Salem learned that there was a person who could make others more powerful, she could see him as a great asset to her. She could have him enhance her own power or the powers of her followers. Or if she can't use him for herself she'll make sure he can't make her enemies more powerful and make her job harder.
Plus, don't forget about what Atlus is doing with Aura. They've found a way to take Aura from one thing and put it into another. If they learned that there was a person who had that EXACT ability, Jaune would become their #1 and favorite experiment. They could try to exploit his power.
And, Jaunes semblance has just awakened, so all we know for such is its basic function. With time and training, Jaune could learn to use it from a distance and MAYBE steal Aura from an enemy. Then he could restore his Aura and by refueling his own Aura, he can continue to enhance the other and keep making them stronger. See what I mean.
I think Ozpin and Qrow will take notice of all this. Then, they will devote most of their time and energy into training Jaune, improving his fighting skills. So they can make sure that he can protect himself, while enhancing the others. Skill wise, Jaune is the weakest of the crew (which is something that needs to be changed), but semblance wise, he may be the most important.
Salem and her crew are scared of Ruby because of her Silver Eye powers. Having someone who can enhance the powers of a Silver Eyed Warrior is extremely dangerous for Salem. Maybe Jaune can enhance Ruby enough that she can go one-on-one with a Maiden and match her blow for blow.
Think about everything that I said. After think all of this through, Jaunes semblance could be the most dangerous to Salem. Don't forget, Tyrian saw something in Jaune that interested him. Guys like him aren't interested in much. Whatever Jaune has that Tyrian is interested in, I bet it's big an important.
Jaune is my favorite character in the whole show. He needs is chance to really get into the plot. As do Ren and Nora, of course.