1. You’re talking about a different subject than me.
2. There’s no consensus for what you’re saying.

1: You’re talking about whether a common ancestor exists for all life, I’m talking about common ancestor for a trait (e.g. tree bark, bird song, these are traits and not organisms).

2: There’s current debate on whether life emerged multiple times or if it was only once. There’s evidence for both and it’s not a settled debate.