oh yeah dif project ._.
Seed is a huge mess to remember and troublesome to even try to.
The Cosmic Era itself is actually a very well developed setting; the series just leaves out or forgets about the more interesting things in favour of boring, unlikable characters and beamspam.
As for the clones and ultimate coordinator project; it's not that hard to remember.
Al Da Flaga wanted to be "immortal", so he had himself cloned. This produced Rau Le Creuset, Rey Za Burrel, and Prayer Reverie.
To get this cloning done, he bribed the scientists by funding their ultimate coordinator project. The only surviving subjects of this were Canard Pars (who was deemed a failure for unspecified reasons), and Kira Yamato (the ultimate coordinator).