When did Goku feel Gotenks's ki?SSJ Vegetto said:Your whole argument relies on ignoring statements / implications / character judgement "just because".
The scan you posted means nothing, it's a fanslation. In the original, he says that "I can't sense their fused ki."
The anime has a filler scene briefly inserted where Kaioshin asks about Goten and Trunks, and Goku answers that he can't sense the kids.
Goku said all of that after they entered the RoSaT, but when it was brought up that Buu might have possibly died as his Ki had disappeared, he noted that he couldn't sense the kids' fused Ki either, which logically would've been the only power in the living realm that was great enough to possibly destroy Buu.
This is a weak argument. You've provided no evidence that pre-RoSaT Super Saiyan Gotenks is weaker than Fat Buu. Yet it's stated multiple times that he is. So unless someone else later says Gotenks is/was weaker than Buu, or Buu and Gotenks had actually fought with the former winning, Goku's statement still stands.
Also, your argument is based entirely around the assumption that Goku WASN'T refering to Gotenks's ssj3 power, when he spoke of how powerful fusion was.
As if Goku, who had never fused before, would even be fully aware of how fusion would affect him/any saiyan.
Seems to me that his only point of reference were the aliens that taught the technique. But surely, he'd only know what mastered fusion would produce. Not half baked fusion.
So his statement only stands by what mastered fusion produces. I.E. ssj3 Gotenks.
So on my telling of the events, it's simply understood and rationally believed, so long as you're willing to accept that Goku's statements are only ascribable to ssj3 Gotenks, which is perfectly reasonable.
That's the lesson the boys learned after all.
At first they believed that base gotenks was enough. They took Goku's statements to be applicable to that form. And they learned otherwise.
Then they thought the same with ssj fusion, but even that wasn't the extent of fusion's power.
Not sure why this is so hard to grasp.