in 2nd play , choose Setsuko route
then choose Zaft route then choose to stay with ZEUTH
Shinn will still remain the main character of GSD and has become a very good character imo
Spoiler for some interesting secret plot changes of GSD in SRWZ:
if u save Rey and Talia then Dullindal will use his last strenght to kill the Frost Brothers along with the Gbits to open a way for ZEUTH team .
Just by playing SRWZ , I think i begin to like Shinn , Rey , Dullindal and Meer now
well , SRW ver only thought
More than that , if u meet the condition to save Stellar , then I must say that my hatred toward Kira Yamato has gone down by half lolz
Btw , in the end I still dislike Kira Yamato for his acts . When I shot down Neo and Sting edi , then I shot down Destroy and calm Stellar edi , suddenly Kira Yamato just "!" and then approached Destroy . Stellar was scared by that and she screamed out " Kuruna !" . Then Jesus Yamato just said " Mou , yamerou ! " and then finished her off . I was totally rage just by seeing that screen . If i havent met the condition to save Stellar at that time , then I will never forgive Kira Yamato for what he has done