not all things are black and white bro... use common sense
. That is how it is brah. Kira and lacus are in love? did you see the way he was acting with her in seed? the ring she gave him does he put it on? nope it is in a chain aorund his neck. Kira is stil hurting over flay obviously as seed goes on, when him and athrun are in a car you saw the flash backs. he did love her. and may have been stil hurt over her. it is the reason he was cting the way he was, and why he changed, besides the ultimate corrdinator but he changed because he never wanted to lose anyone again, and of course again his true origins. You must understand he is not a corrdinator, like the others.... he is beyond that. I would not act normal around anyone, he was a test tube experiment, he is a human engineered computer. everony else had genes altered but were given by birth. except for him and his brother kanard, (yeah I say they related). If anything they need to revive seed. They can do an astray cross over, or add canard... to cause trouble and conflict. look at how kira nad cagali's mom were fighting she said no more.... no more.... enough is enough. so it is not the frist time he eggs were used. SO.... KIRA cagalli and canard are probably related one more thing too.
Listen canard may be a UC no different than kira.. Kira... would have been labeled failed if those scientists had him doing tests too... Kira grew up with love, and was not treated like trash. Canards environment is what got him labeled a failed ultimate coordinator... he did not grow up like kira. What was the difference beetween canard and kira? durandall answered it when he went to visit canard in sun glasses btw. He told him kira was responsible, kira yamato, etc etc, he took away what you should have had. If gilbert had his hands on both of them they would have been subjected to the same treatment.
Canard is not a failed ultimate coordinator it is impossible, and we see why, that is it. So if they bring back seed movie have canard in it, towards the end or something. I mean what would the movie be about if they were not going to include stuff on astray or kira origin and include and close all loose ends, it would mkae sense to include canard.... so seed cna have the movie and another season and another movie... Since canard is no different than him, and could cause trouble for a while even if he let his issues with kira go, and of course join at the end.
Anything GS related for now will be concerning kira's origins and mars, which can be milked, and the origins of the dna used for coordinators, and other stuff. Zaft.... and more. Zaft are always causing trouble rise of thr earth federation ;/