I loved the Invasion/seeding of worlds story, mainly because it artfully explained all those humanoid aliens in the Legion.
However, looking back on those stories, it's hard not to see them as a place to "put" wonderful story elements like Mon-El since they had been kicked out of the Superman mythos.
Now that we have a creative and editorial regime that wants Superman tied into the Legion, and the Legion tied constructively to the present day, I think I prefer Mon-El to be whom he was created to be -- Superman's "Big Brother."
I hope we see more of Lar in the present day DCU, and I hope eventually Superman gets to meet Lar--alive, healthy and happy--in the 31st Century. That will be an extra hanky scene, I hope.