I call shens on our first common ancestor. The claim is that all purple archaea, thence all life on Earth, sprung from this one 4.2Gya. That's like 300My after Theia.
No stromatolites, no magnets... no hydro cycle. We're practically in Hades.
As to how we "fix" this: "dark comet"? (Apparently the definition is "it has or had a coma", thus allowing for 67/B.) Specifically maybe life originated on an asteroid or on Newfoundworld, before arriving here. Which arrival postdated 4.2Gya.
Or that molecular clock needs recalibrating as has needed doing for carbon-14 in antiquity.
Could be both or either or neither, but I need much convincing of what we're being asked to accept as our first choice, that life of any sort had a chance in Earth at this point.
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