I finally came up with a plausible theory for early PS3

[etony33]

An NPC in Lashute says that they needed "Rhys to bring Satellite back". They obviously couldn't go all over the Alisa III with the entrances blocked off, but what they possibly could have done is messed with the weather control system. Seeing as Rulakir is a pilot (as mentioned by an NPC in Divisia Castle in Gen 3), he likely had a very good understanding on how things worked, enabling him to screw with Aquatica's weather.

They figured that someone from Aquatica would have to go to Aridia to fix it, and that they'd need an Orakian to do it. So, Lyle unwittingly became their pawn, though he had his own plan for bringing Aquatica back to normal. With his cousin Maia having mysteriously lost her memory, Lyle figured he could get her into Landen, where she'd probably end up falling in love with an Orakian, at which point Lyle could swoop in, bring her back to Cille, and try to manipulate that Orakian into fixing the weather control tower. When the Orakian in question turned out to be the prince of Landen, he got the best possible result from his plan. He was able to subtly direct Rhys toward the weather control tower. At this point, Lyle may or may not have intended to just go back to Shusoran, but he seemingly took a liking to Rhys and decided to stay with him to see what kind of a person he was (or, alternatively, his plan was simply to sabotage Rhys's attempt to get to Maia). Either way, Rhys was nothing like Lyle expected an Orakian to be, shattering the misconceptions that Lyle had about Orakians in general. At some point between his meeting Rhys in the weather control tower and their trip to Shusoran, Lyle decided to actually aid Rhys in his quest.

[MadBill]

I just don't get it why Lyle would fight his own uncle on Rhys' behalf.

"Oh ok, I'll help you beat the s%&t out of my uncle, who happens to be a king/governor/whatever and after that we'll be just fine, you'll see."

It would make more sense if Lyle simply refused to battle Cille.

"Dude, you wanna do this, then do it on your own...I'm outta here."

[Zucca]

Since it's so long time I last played PSIII, I'd need some kind of family tree (map) to comprehend all this...

[etony33]

I can briefly type it out.

Orakio ... Orakio's child ... Rhys's father ... Rhys
Rulakir (Orakio's brother, Rhys's great-great-...-great uncle)

Lyle's dad and Maia's dad were likely brothers. Possibly descended from Laya, which would make (younger) Laya their great-great-...-great aunt.

Maia and Lyle are first cousins.

Beyond that, it depends on who you marry for the later generations

[etony33]

Sean/Crys:

Rhys (descendant of Orakio, distant nephew of Rulakir)
Maia (daughter of King of Cille, niece of Lyle's mom/dad)
Lyle (nephew of King of Cille, first cousin of Maia)
Lena (daughter of King of Satera)

Ayn (son of Rhys and Maia, second cousin of Thea)
Thea (daughter of Lyle, second cousin of Ayn)
Sari (daughter of Lena)

Sean is the son of Ayn and Thea. Crys is the son of Ayn and Sari. Either way, Laya is Laya's sister, and Kara is the daughter of Lune and an unknown woman.

[etony33]

Adan/Aron:

Nial: Son of Rhys and Lena
Ryan: ???
Laya: Same as in Sean/Crys
Lune: ???, brother of Alair
Alair: ???, sister of Lune

Adan is the son of Nial and Laya. Gwyn is Adan's twin sister. Kara is Lune's daughter, but she's different than the Sean/Crts version. Aron is the son of Nial and Alair, and thus Kara's first cousin.

[etony33]

I just don't get it why Lyle would fight his own uncle on Rhys' behalf.

Lyle marches to the beat of his own drummer. He clearly doesn't take his responsibilities as prince of Shusoran seriously.

[BenoitRen]

I don't see why an Orakian-hating Layan would risk his cousin by stranding her in Orakian lands. It's a bit too convoluted. Lyle could just steal the gem by himself.

[etony33]

Well, the fact that Lyle a) knew exactly when they were marrying and b) could turn into a dragon at well indicates that he had everything under control.

He didn't just need the gem. He needed a descendant of Orakio to control Wren in order to fix the weather.