1. It is known that a Titan would need to ingest a Titan shifter's spinal fluid in order to get their powers.
2. Zeke is able to extract his spinal fluid which he uses to turn other Eldians into Titans.
So if a Titan ingests Zeke's spinal fluid that he had extracted, would that Titan become the new Beast Titan and Zeke loses his powers? Or would Zeke retain his powers, creating the possibility for multiple Titan shifters?
Hey, who knows, maybe that's Zeke's plan! An army of Beast Titans would certainly be unstoppable ;)
Good point. Although this is unrelated, I've also always wondered how Zeke injected his spinal fluid into other Eldians. There was a theory that it was put into their well, but wouldn't the spinal fluid just evaporate?
And now, to address the post -- I think that Zeke wouldn't just let another titan injest the spinal fluid. The Marleyan Titan Biology Research Society (whoa, I remembered that?) might've had him do some experiments with Eldians (yes, as cruel as that seems... it probably happened). I'm guessing that you have to actually sever the spinal cord/nape/wherever the powers are contained in order to gain the powers or pass them on.
I think the point with Zeke is he injected his OWN spinal fluid into people, not his TITAN's spinal fluid. Human spinal fluid doesn't turn people into titans, or evaporate quickly or any of that. It just establishes a connection between them and Zeke so that he can transform them with his scream ability.
If he injected his titan's fluid into them they would have just transformed right away like how titans are normally created.
I don't think a titan ingesting Zeke's spinal fluid while Zeke was still alive would do anything in regards to passing on his beast titan. The currect holder has to die before anyone else can receive the titan.
What we don't know is, maybe it would allow Zeke to control the other titan with his powers, maybe not.
While I'm sure Zeke must be dead for passing of power to happen (after all, first mindless Titans had to be created when Ymir was the only one around), the thing you're questioning might be a focal point how Ymir's power was split in the first place.
...also reading that made me think of ME3 "Control the Reapers" ending, only with Zeke's immaterial conciousness residing within and directing the Titans he created. Ouch.
I dont know if this was said before because im lazy and didnt feel like taking the time to read the other replies, but it wouldnt work like that because the titan would have to eat zeke's spine to become the beast titan. Spinal fluid only transforms human into titans, not into titan shifters.
I don't think it is possible to create more Titan shifters, but I do see the confusion here. Realistically, I believe that the holder of the power needs to die in order to pass it on (via paths). However, it is a little bit unclear.
Here's how it all goes down:
There can only be nine titan shifters at one time. A human is either injected with or ingests a titan shifter's spinal fluid to become a Pure titan (aka a mindless human-eating titan). However, a titan can retain their human form and become a shifter if they eat a titan shifter, therefore inheriting the titan belonging to that person. That's where the titans' insatiable hunger comes from. They do not need to eat to survive, their hunger is only constant until they consume a shifter and "complete" the transformation. So no, Zeke can not create more titan shifters because he would have to be eaten for that to happen. He'd only be able to transform one person into a Pure titan and then die in the process of making them the Beast titan.
It is also possible for one person to have multiple titans inside them. Grisha Yeager ate Freida Ress' Founding titan and inherited it, leaving him with both the Attack titan and the Founding titan. Eren later consumed him and gained those titans.