We can see in the post credit of murder drones, Uzi is like a hologram BC she consume the Cyn heart (or Core how you want to call)

Then we can understand about this is not a happy ending, we can see that Uzi is not alive, we can see she is dead

then the expression of her is like deppresed BC she feels controlled and manipuled by Cyn (her tail)

So this is not a good finale...this can be a sad finale

And Cyn is trying to control everything good to her favor using a clone of Uzi...or just a simple Hologram

Hiding this secret to N...

(This is just my theorie, idk, give me your opinion)