Zantetsuken wrote:I don't remember that being the case at all. And I don't know what this S. Kaioshinn Buu is, I've never seen him before. I remember him getting more powerful and then him getting physically smaller.
The S. Kaioshin Boo is the huge Boo. Pure Boo absorbed South Kaioshin, and transformed into that form. Then he absorbed the Dai Kaioshin, and transformed into Fat Boo, and got weaker.
Chapter: 508 (DBZ 314), P4.2-7
Kaioshin: “In m…my era there were five Kaioshins…until they were defeated by the Majin Boo that the wizard Babidi created…I was the youngest and most powerless one, but I somehow survived, with only heavy injuries…But the other four fell to Boo…First, two were killed…the North Kaioshin and the West Kaioshin….And then the South Kaioshin, the burliest and strongest one, was…somehow absorbed by Boo….. “
Elder Kaioshin: …And he became that huge Boo from before? “
Kaioshin: “…Yes…Next to be absorbed was the fat but kind and gentle Dai-Kaioshin….The Majin Boo that Bibidi created was evil itself, a failed creation that even Bibidi himself couldn’t handle, but by absorbing the Dai-Kaioshin, he somehow become controllable…. “
Elder Kaioshin: “…So he was finally completed…Which is to say…that this current…small Majin Boo…is the initial…mo…most troublesome one…”
Kaioshin: “….Yes…the heart which he gained by going so far as to lower his power through absorption…has returned once again to the way it was…he has no self-control whatsoever…he has become evil itself…”
When Evil Boo turned into S. Kaioshin Boo, Goku & Vegeta noticed that his ki was increasing, and they started getting scared.
Chapter: 507 (DBZ 313), P13.5
Context: as evil Boo reverts to his South Kaioshin form
Goku: “H-hey…Vegeta…His ki is increasing, ain’t it…!?”
Chapter: 508 (DBZ 314), P1.3
Context: evil Boo continues to revert to his South Kaioshin form
Goku: “…H-hey…He’s changed into an awfully bulky guy…”
And then, Boo transformed again, this time into Pure Boo:
Chapter: 508 (DBZ 314), P2.3-7, P3.3
Context: after reverting to his South Kaioshin form, Boo continues to change
Vegeta: “…Look…He intends to perform another transformation…”
[ ]
Goku: “…I wish he’d cut that out…”
Kaioshin: “Th-this can’t be…it’s impossible…He’s cha-changing back…”
*Boo changes back into his pure form*
Kaioshin: “…I…I knew it…”
Chapter: 508 (DBZ 314), P3.4-6
Context: after Boo reverts to his pure form
Goku: “…”
Vegeta: “……Heh…Heheheh…Look! He’s shrunk down quite a bit!”
Goku: “We did it! This way, we might be able to manage something.”
Note: "He’s shrunk" is chidzimu, which typically refers to physical shrinking (like with Bulma's Micro Band) and throughout DB is never used to refer to ki diminishing. So Vegeta's probably talking about how Boo’s body has shrunk. That doesn't mean Boo's ki didn't go down too, but it's not what Vegeta's talking about here.
Goku got scared when he heard that Boo was transforming again, fearing that he would get even stronger. However, it turns out that he didn't get stronger, since they start mocking him & believed that they had a chance, unlike before against Evil Boo. And even though they admitted that they underestimated Pure Boo, they still believed that they could kill him with Super Saiyan 3.
Chapter: 506 (DBZ 312), P12.4-5
Context: after Goku and Vegeta revert Boo back to regular evil Boo
Goku: “Hehhe~~eh! With this, Boo’s power should have fallen significantly! We’re almost there! See, see: the size of his ki is completely different than before!”
Vegeta: “Alright! Let’s blast out of here and escape!”
Goku: “Wait! Even though Boo has returned to normal a whole lot, we’re still simply no match for his strength! If we go outside like this, we’ll definitely be done in…!”
Chapter: 506 (DBZ 312), P13.1
Context: still talking about how they’re no match for Boo
Goku: “…But there is one way we can win!”
Vegeta: “You want to say Fusion, right? Well who cares about that?!”
Goku: “Huh? You know about it?”
Vegeta: “I saw it from the afterlife…You’ve got to be joking! You think I’d perform those ugly poses…?! Anyway, I thought I told you that I’m not going to merge with you a second time.”
Chapter: 507 (DBZ 313), P2.4-5
Context: after evil Boo appears inside his own body
Vegeta: “Da…damn it…! Th-this could be bad…”
Goku: “Di-didn’t I tell your to wear your Potara?! Th-this is why! If we could just go outside and merge, then this kind of guy would be an easy victory!”
Against Evil Boo, Fusion or Potara was their only hope. S. Kaioshin Boo was even stronger. But Pure Boo could be handled without Fusion or Potara.