Choryujin didn't kill the dinosaurs. It was Samekh.
Shit started getting really interesting. The play is clearly the 'prequel' to Fish Girl's story and explains a lot about it. It's been revealed, somewhere(don't have a source), that when a Driver apprivoises a Cybody, s/he inherits some of the memories of its previous Drivers. Now that the story of the Fish Planet is coming from two different sources, Fish Girl and Night Flight, we pretty much know that the story of Sam isn't some bullshit that she made up a la 1001 Arabian Nights, to keep Head from killing her or something, and that Sarina, the writer of the play, might not be human.
In Fishy's story, the King of the Fish Planet tells Sam that if he wants to use the Ship, he has to kill the girl and fill the Ship with the girl's blood to power it. In Sarina's story, Columner, aka the King, has no trouble sailing the Ship, without anyone's blood powering it, so it may just mean that the king was stricken with grief after having lost Kleis to his obsession for the Ship, and wanted to confirm that Sam had the determination to be alone by having him kill the girl.
I'm not exactly sure what the significance of Kleis being invisible and intangible to most people is, but the only ones able to see her were Columner and the witch(and Mark), who are pretty much confirmed to be the pilots of Samekh and Ayingott respectively, and the only one able to touch her was the witch. My theory is that Kleis is supposed to be some kind of Maiden and the only people that can 'see' her(ie: recognize that she's a Maiden) are other Drivers, but the only ones that can 'touch' her(ie: break her Seal. Do note that the whole breaking the Maiden's Seal thing is allegorical to sex.) are the drivers of Warrior-class Cybodies, like Ayingott, and the 'jewel' that the witch claims can be used to see and touch Kleis is her Mark.
When she offered the jewel to Columner, in exchange for the Ship, that only he can operate for some reason, she meant that she was willing to trade her Mark for Columner's Mark, presumably using the same method Head used to receive Katashiro's Mark. In other words, she was trying to exchange Ayingott for Samekh. In addition, when she says that she was searching for 7000 years for someone who can operate Samekh, she was referring to the fact that most of Samekh's drivers enter into a lifelong coma upon apprivoising due to an insufficient amount of Libido to operate it, and, of course, she's the only one that finds out about Columner's Mark, due to her Cybody's power, Ayingott's eyes. Also, this event is probably the reason why Ayingott was found broken in Samekh's hand.
At the end of the play, Mark and the unnamed woman begin talking to each other again, but it becomes plainly obvious, when Jaguar mentions that their conversation isn't in the script, that this isn't a conversation between Mark and the woman, but between Takuto and Sarina, and shit gets all meta. During this scene, it's revealed that-holy shit-VP can talk. Also, Takuto can possibly pilot Samekh.
At the end of the episode, VP mentions that Tauburn is a Cybody made for Earthlings, and, therefore, may have unknown abilities, which means that Sarina and VP probably weren't bullshitting when they told Takuto that they're space aliens.
EDIT: In the play, the King became immortal as a result of being one with Samekh, which is why, in Fishy's story, he sought the Squid Emperor's blood to kill himself with it. The important detail here is the 'being one with Samekh' part, which sounds a lot like Head's description of Phase 4, sans the whole being stuck in Zero Time forever part. When Katashiro says something along the lines of: 'As I suspected... Your heart had been taken by Zero Time.', it could also mean, aside from the fact that Head's obsessed with Zero Time, that a part of Head has literally been left behind in Zero Time. This could mean Head is already in Phase 4, the way that Takuto was already in Phase 3 at the beginning of the show, and, like the King, became one with his Cybody and is immortal as a result of it, and when he says that Phase 4 Drivers will be trapped in Zero Time forever, when they don't enter Phase 5 in quick succession, he means that their capacity to empathize with other people will be trapped.
I also noticed that Columner, Sam, and Head have all disgraced their lovers to gain a power, that, in the end, left them unsatisfied, and, if my guess is right, that this happens in a cycle, with Sugata being the next one in line, since it says in the episode preview that Sugata's taking Wako out on a date next ep, in which he'll probably do something to really fuck shit up, or, maybe, the last few eps of Star Driver will be a repeat of what happens in Fishy's story and the play, but with Head as Columner, Sugata as the Squid Emperor, and Takuto as Sam, except Takuto won't fuck it up by killing Wako.
I WANT TO STOP THINKING ABOUT THIS BUT I CAN'T.
Another Edit: My friend pointed out to me that Ayingott is also a King-class Cybody, like Samekh, but it's been confirmed that Ayingott is a 'fallen' King-class Cybody, which pretty much makes it like the rest of the Warrior-class Cybodies.