That is your OPINION and apparently some scientists disagree with you as those are all theories of evolution and many use different mechanisms.
You can't just lay a blanket over them and say I believe them all.
Symbiogenesis, or
endosymbiotic theory, is an evolutionary theory that explains the origin of
eukaryotic cells from
prokaryotes. It states that several key
organellesof eukaryotes originated as a
symbiosis between separate single-celled organisms. According to this theory,
mitochondria,
plastids (for example
chloroplasts), and possibly other organelles representing formerly free-living
bacteria (prokaryotes) were taken inside another cell as an
endosymbiont around 1.5 billion years ago. Molecular and biochemical evidence suggest that mitochondria developed from
proteobacteria (in particular,
Rickettsiales, the
SAR11 clade,
[1][2] or close relatives) and chloroplasts from
cyanobacteria (in particular, nitrogen-fixing filamentous cyanobacteria
[3][4]).
https://en.wikipedia.org/wiki/Symbiogenesis