Zetsus are prior IT victims that came off gedo. It just so happens that they and hashi share mokuton. Stilll zetsu is much degraded to be of a factor in Obito becoming juubi jin so main reason is him bing uchiha.
Bloomed into what?, Bloomed enough? Bloomed after his power up maybe?
Yea sage also said that the power came from people(help) and then he gave him some more power and then sons killed each other. Fodder it is U_U
Yeah and guess what, that's from having people wrapped up like the alliance is now and no one was wrapped up when Madara got the Gedo Mezo. Why do you think Madara said Hashirama's cells created Zetsus? They grew from the Hashirama cells he was was replicating? Also why do you think Hashirama and Tobirama would Orochimaru body was mostly made from Hashirana's cells? The Sage said with help and hard work Ashura's chakra bloomed. So Ashura being Hagaromo successor makes him a fodder? So by your logic Sasuke, Naruto, Madara, Obito, Kakashi, Danzo, Orochimaru, Kabuto are all fodders for using powers given or taken from others?
Bold 1: How do you know that an Uchiha wouldn't be suspected of being able to handle it? How do you know they wouldn't pass the test?
Bold 2: Once again, how do you know they'd fail the test? Also, many people still died in Kumogakure when they tested for Gyuuki. Therefore, those Kumo shinobi or other random people haven't been shown to be any stronger or have any more suitable bodies than Uchihas.
Can you name 1 Uchiha who wasn't given Hashirama's DNA before becoming a Jinchuuriki? Why didn't Madara seal Kurama inside himself which would have made him far stronger, inside of using his Sharingan to control Kurama when it's said Jinchuurikis can better focus Bijuu's chakra? Madara didn't have Hashirama's DNA at that point so why didn't he become the Jinchuuriki? The one before Bee said his father and brother died then he died so that's 3 known deaths. Uchihas aren't known for having strong bodies nor was anyone from Cloud, the Raikage trained for their tough bodies and even they don't think they are suitable