I think every comment in the initial debut of SSJG makes it appear like Goku had expectations of SSJ God, but at the end it surpassed it greatly, this is also shown considering that after acknowledging that not even fusing with Vegeta, he asked himself if that SSJ God could be achieved through training.
So, what would be your numbers for:
Vegetto (Buu Saga) = 1
Vegetto (BoG/pre ritual) = ?
Expected SSJ God = ?
Initial SSJ God Goku (BoG) = ?
Goku saying that even him & Vegeta's fusion wouldn't stand a chance isn't really a good statement, this was stated with him having no knowledge of God's power, so he can't compare them accurately. Goku however says this initially after transforming:
And this:
Beyond his imagination should include his Potara fusion, so ultimately, I believe God > Potara fusion (BoG) does ring true. This could potentially also encompass a SSJ3 Vegetto.
This is true for the manga also:
So...
Vegetto (Boo Saga) = 1
Boohan is weaker than Vegetto, but I'll just put him as the same for simplicity.
Boohan = 1
Bootenks 1-
Gohan = 0.5
Gotenks = 0.5-
I think Vegeta's shock at Goku being taken out in two hits indicates that SSJ3 Goku is comparable to Ultimate Gohan. After all, what would it matter if Goku was taken out so easily if Gohan could put up a much better fight than him?
So SSJ3 Goku = 0.5
And now I'm just realising I may have to go over the whole Boo Saga to explain my difference between SSJ3 Goku & Vegetto. Well, if you want I will, but it's an 800x difference.
That would make BoG Vegetto 0.5 x 800 = 400
SSJ3 Vegetto would be 400^2, which is 160,000.
So...
Vegetto (Buu Saga) = 1
Vegetto (BoG/pre ritual) = 400 [SSJ3 is 160,000]
Expected SSJ God = ? No clue tbh, could be anything, but he was hell bent on utilising God so it should at least be 160,000
Initial SSJ God Goku (BoG) = 160,000+
Concerning the manga, there's nothing that really puts Goku above Gohan, but if we take into account the Yo Son Goku special which was supervised by AT:
Goku's SSJ should be at least comparable to base Gotenks (maybe SSJ depending on how you interpret it) based on his performance against Avocado. This is also like 1 or 2 years before BoG, so this is lowballed. You can read it here
https://mangadex.org/chapter/cbf04bc4-08c2-4952-a9e2-bd1fb88cf898/30
So going back to my numbers
Vegetto (Boo Saga) = 1
Boohan = 1
Bootenks 1-
Gohan = 0.5
Gotenks = 0.5-
Base Gotenks = 0.00125
SSJ Goku (BoG) = 0.00125
SSJ3 Goku (BoG) = 0.01 (0.00125 x 8)
Vegetto (BoG/pre ritual) = 8 [SSJ3 is 3,200]
Expected SSJ God = 3,200
Initial SSJ God Goku (BoG) = 3,200+
What u got?