Ok now Jesse. Is he actually alive? If it's a Force Wound, can it be undone? Or will Jesse die again when the spirit thing is stopped?
Yes and no. Jesse and the rest of the crew of the Tribunal died in the crash. Ahsoka and Rex laid them to rest, erected the grave markers and left behind the lightsabers as a sign of respect and mourning. The Wound in the Force was originally just a manifestation of pain, loss and grief, that surrounded the moon's atmosphere (the space where Alderaan once stood has a much darker feel than this moon)
The trouble arises when Darth Vader shows up, contaminating the origin point of the Wound with the sheer amount of dark side energy he practically expels, and disrespects the lost souls of the Tribunal by stealing away the saber that was left behind for them. The Force is a living thing in its own right, and it was already hurt there... So seeing such disrespect upset it. Made the wound fester into something that was quite honestly pretty unnatural.
That's what Torrent, aka the thing in the storm, is.
A series of souls torn away from eternal rest and contorted into an angry, confused and hateful entity that doesn't know why it's been abandoned. Why Rex would leave them behind... They're dead, but not quite. Alive, but also not quite... And healing that Force Wound won't leave a clean spot. It's gonna scar heavily... Which means they won't exactly disappear, even if they're no longer a vengeful monster. But it's definitely gonna be an anomaly that will need a lot of time to recover from the abysmal horror that was Order 66.
The suckiest part is that, because of where he stood on the command chain, Jesse is basically the prime soul that controls what he and his brothers have become. It's his face, his voice, his body that everyone else sees when they're not an unstable mess. And as such he's also hyper aware he's not completely himself, and that he's done some horrifying things while under the influence of hatred and pain, and that's just... A lot to take in... More so than the fact he's some kind of undead abomination hivemind.