That can be salvaged by saying that they need to be carefull not to damage the seeds. It will not happen (not with this writing team anyway) but it can have some stakes as it might be hard to destroy the body without killing the seeds in the heat of battle.
I don't think it can be salvaged. It should've been if this Tree Person died, the real thing dies as well. Meaning, they can't really harm Tree Sasuke. Instead, they could've had Tree Sasuke slowly regain his memories by interacting and fighting against Sarada and question what he's doing. Maybe he doesn't understand the feelings he gets from those memories, because again he was just born and seriously questions what they're doing. In the end eventually turning on Jura and being instrumental in defeating the Trees. Maybe Konohamaru has the same thing with Moegi, only for Jura to take her out, not tolerating two traitors, really raising stakes.
Bottom line is, there was a way to do this where we would've gotten some dramatic stakes and character development and it honestly seemed for awhile like this was the route we'd go. Then in this chapter though, we don't do that. In fact this might be the last chapter we see of Tree Sasuke.
I got a headache reading all of that. Not because of what you wrote, but because the "plot" isn't plot anymore. It's nonsense. Plain, simple nonsense. Even when I try to turn off my brain, there's this punishing synapse that maintains my engagement and causes a malfunction. Not even my old Naruto loving ass would read this shit because it doesn't make a lick of sense.
I just can't understand the baffling decisions made here. This is such a short sighted decision that ruins what the arc could be later on. I think Kishimoto's fly by the seat writing is responsible. These decisions are just going to cause problems and undermine things later. It's not going to age well when people start asking "What's the point of this arc?" There's no grand story being built up. There's no character development being done here. There's just....nothing.
I hesitate to blame Ikemoto for this as I get some serious "Kishimoto Trademark Late-Naruto Laziness" vibes from this. As for Kashin Koji, it was a mistake to make him a clone of Jiraiya. You are drawing comparison to a far more interesting character. As for how he knows, you could have him be familiar with their chakra from his time as a member of Kara.
At this point I've long given up on anything regarding Kashin Koji making sense. The thing is, there is no answer to "How does Koji know these things" that's satisfying.
The Trees were literally just born yesterday. These things are all Code's creations by messing with the Divine Tree and making the Claw Grimes. Code had no friggin clue this would happen though. It was an anomaly that was a complete accident. Nobody know the Divine Trees could do this. Hell, even the Divine Trees themselves don't fully understand how they came into being. So how Kashin Koji knows anything about these things is way beyond any reasonable doubt. The Trees don't seem to know anything about themselves either, that's why they're so obsessed with finding a purpose. The only possible explanation is that Kashin Koji spies on them and learns of the Bulbs from a conversation they have. But then the question is-when? And that ties into the pacing issue.
To clarify, the pace is half that of a WEEKLY manga. Not a MONTHLY one. It is 1/4th of what a monthly manga should be like.
TBV only takes place over the course of a few days. I'm not even sure 48 hours have passed in-universe time. If 48 hours have passed, 72 hours certainly have not. These have all been very congruent, one after the other.
Since I started writing this response, I decided to go back and re-read earlier chapters. The answer being built up to is that somehow Boruto and Kashin Koji knew all along that Code messing with the Divine Tree would make the Tree People. How they knew it could do this is beyond me. The translation I read seems a bit clearer, and it seems to me like they're heavily hinting at Kashin Koji somehow seeing the future. Him and Boruto have working together ever since Sasuke died to prevent that future. There's a huge allusion to some kind of future-seeing or time traveling being hinted at. Which I can't imagine won't make a dozen plot holes once it finally gets explored.