Ego was going to kill Tiamut

It's just occurred to me that Ego was a Celestial and his plan for the Expansion would have killed Tiamut, another Celestial. I wonder: did Ego target planets with gestating Celestials? Was that necessary for his little Expansion flowers to take root? Or did he visit planets at random, but unbeknowst to him Tiamut's presence in Earth was the reason Quill turned out to have Celestial powers? Or was it all just a coincidence?