Well, its depending on what you considering sequel...
The chronological order will be:
Jesus => Aegis in the Dark => Aegis in the Dawn => Jesus Sajin Kouro/UDDUP
The crossover situation is: The main events (there are also several flashback chapters that take place right after the Jesus manga) of the first two volumes of Jesus Sajin Kouro take place before UDDUA, from the third volume onwards, the crossover begins and the plot develops more or less in parallel, showing some of the same events from the point of view of different protagonists. 154 - final chapter of Sajin Kouro this is about the same moment as the chapter 154 of UDDUP after which the plot continues there for several more volumes and approximately concludes the entire history of this universe with little participation of Jesus and other characters of Sajin Kouro.
But the problem with Aegis is that it's actually a very long manga (26 volumes in dark +6 volumes in dawn) but Jesus is involved in maybe 10-15% of all the events from vol 11. The manga is mostly not about him. Although some events from Aegis also continued in Sajin Kouro and some characters reappeared, I haven't translated these two manga completely yet, even into my language. I'm not giving up on Aegis, but let's say it will definitely take time to translate it. And Sajin Kouro already fully translated into my language, the photoshop work is mostly done so you can expect steady releases of chapters within a reasonable time frame.