Ask and you shall receive. Can be taken as a separate AU altogether.
1 - Sadly, Tenpou, Konzen and Kenren die. Not killing Li Touten turns out to be a mistake, those three eventually sacrifice themselves. Nataku is dragged back to heaven screaming. Goku is imprisoned and honestly, isn’t responsive much by the time they manage to drag him to that cell. Heaven is really happy that they have managed to take care of the traitors, they are celebrating Nataku’s return, and things in general aren’t great.
2 - Goku spends three days at the very most in his prison because Nataku escapes heaven (Gojun and Homura helped. Homura doesn’t know he helped) and broke him out. Since Nataku didn’t have the fancy “the bars and the chains are just breaking on their own” effect, he brought a sword and a mass. Had to carry Goku out too. (I won’t lie to you, Goku had about several weeks when he didn’t manage to get out of bed. But eventually, thanks to the knowledge that those three will be reborn, he manages to drag himself out of it.)
3 - I don’t know how much time has passed but I can tell you that Goku and Nataku will spend less time waiting for the rest of the Sanzou party to be born than they lived with those three disaster gods. In the meantime, they occupy their time by waging absolute war on the heaven. Li Touten doesn’t make it. The high ranked gods don’t make it. Actually, anyone who stayed up there and didn’t take a nice vacation plainly didn’t make it. They launched multiple raids and made an absolute carnage. Pure revenge time. Several gods are genuinely mourning Konzen, Kenren and Tenpou because they were apparently the only thing standing on the way of homicidal overpowered children. (For Plot Reasons, they left enough alive for them to be a nuisance in the future.)
4 - Now, Goku isn’t aware of the details of everyone’s tragic backstories because they are pretty private people and do not share much but he knows that everyone has a tragic backstory. The plan was always to collect all the other party members before they could get adequately traumatized. Unfortunately, Nataku and Goku got distracted by something else and Sanzou, Gojyo and Hakkai went through some stuff (Hakkai, not so much, though). In any case, none of then is a day over 20 when what they suspect to be two overpowered yokai with limiters that aren’t doing their jobs barge into their lives and refuse to live.
5 - Eventually, the heavens orders Sanzou and two men that are trusted with this mission (Gojyo and Hakkai do not understand why they are trusted, they do not want to go, why???) to find two monsters who terrorized Heaven: a fallen war god and the great sage equaling Heaven (at this point, all three men are pointing out that there must be someone more qualified to take care of those guys). In any case, they go on that journey, with Nataku and Goku on the backseat of the jeep and I want you to imagine their faces as they slowly realize who those two dumb and crazily OP teenagers are.
+ 1 - Since Gojoun is alive, Jeep is not a white dragon but a familiar bear with golden eyes. For some reason, he is always trying to take a bite out of Gojyo.
+ 2 - There is at least one instance when Sanzou, Hakkai and Gojyo must team up to save Gojoun who was taken hostage by Nataku and Goku. Not only do Goku and Nataku not want the guy as a hostage but the team-up fails so hard that Gojoun has to be the one to save them.