Piccolo replaces Gohan for the mission to Namek. Krillin and Piccolo
do not save Dende, so they don't get extra info and they keep
wandering in the dark with their kis suppressed instead. Eventually,
they find Guru's house. By that time, Vegeta has done his stuff
(killed Dodoria, got a zenkai from Zarbon, stolen Freeza's balls)
and is waiting with his senses sharp to detect the Z fighters' kis.
As for Zarbon, since he didn't manage to find Vegeta, it's hard to
figure out what he does. Escapes to outer space? Can he survive
with no oxygen? Nah, he probably hides somewhere on Namek.
Piccolo and Krillin get their potentials unlocked and wait for
Goku and Gohan to arrive, so that they can formulate a plan.
Ginyu Forces find them. They go to fight somewhere else, so that
they won't risk Guru's life.
Vegeta senses their battle powers rising and goes to check it out.
He watches the battles while hidden behind some rock and with
his ki suppressed. He mumbles curses for his weakness.
Gurd is defeated one way or another. Nail puts up an even fight
with Recoome (Piccolo's potential has not been fully unlocked yet,
so he wouldn't stand a chance) and buys enough time for Goku
and Gohan to arrive. Goku is about as strong as Dodoria or Handsome
Zarbon (without kaioken). Gohan is close to Nappa (not the Daiz
version).
Goku one shots Recoome with a 3x Kaioken and asks Recoome's
comrades to take him and leave before they get hurt. Ginyu decides
to fight Goku. The fight is even for a while, until Goku powers up to
10x Kaioken, just for display, and gives Ginyu Forces one more chance
to escape.
Ginyu takes Goku's body and attacks the others. Soon, they find out
they can beat Ginyu-Goku. However, Jeice and Butta join the fight.
Jeice easily takes Nail, who's tired after his fight against Recoome,
while Butta takes Piccolo, Krillin and Gohan.
All Z fighters are killed. Ginyu Forces collect their dragonball and
resume their seacrh for the other 6. Vegeta keeps his chi hidden,
hoping for a chance to steal the seventh ball from Ginyu Forces.
Eventually, Guru dies and the balls become stones. Ginyu Forces
go back to Freeza and say something like 'sorry, boss, mission
failed'. Freeza punishes them with a good beating, destroys Namek
(thus killing Vegeta and Zarbon) and decides to forget about that
story.
After Ginyu is healed from Freeza's punishment, he realizes he's
stronger than before. Eventually, he discovers the advantages of
having a Saiyan's body and starts training it. His power level
reaches low millions, but he cannot use kaioken or turn into a
Super Saiyan. Eventually, he dies of the heart virus that was in
Goku's body, unless he takes another body when he realizes he's
sick.
Meanwhile, on Earth, Androids devastate the world until Cell awakens
and absorbs them. Perfect Cell destroys whatever life forms are still
left on Earth, destroys the planet itself and goes to explore the universe.
He clashes with Freeza's empire and takes over, unless Freeza is smart
enough to withdraw somewhere and train for 4 months (but i don't think
he is). Cell spawn a society of Cell Jrs and reforms the universe after
his image.
If Babidi manages to awaken Buu someday, Cell clashes with Buu. When
he sees he can't win, he tries to take Buu with him by selfdestructing.
Buu regenerates, but so does Cell, with a zenkai. The fight resumes,
but soon Cell realizes Buu is a retard and talks him into killing Babidi.
Cell and Buu become pals. Buu and Cell Jrs play many fun games
together.
If that version of Cell was predicted by the oracle fish to be the Super
Saiyan God, Beerus goes to find him. Cell (post god status), Buu and
Cell Jrs participate in Universe 6 tournament, assuming Beerus and
Champa decided to hold it even if Beerus woke up later than in canon.
If Zamasu gets mad at Cell, the Zero Mortal Plan succeeds. Otherwise,
everything keeps being fine. When Zeno decides to erase the universes,
Cell sends Buu and Cell Jrs to play with him, so Zeno changes his mind.
Buu, Cell Jrs and Zeno play many fun games together.