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Can Hiruzen take the MC as an apprentice.He is the Professor and the God of Shinobi.The MC can learn a lot of things from him and would serve as a protection from Danzo.From the earlier chapters it is seen that Hiruzen is sad due to how his three students turned out and this might be a way for him to actually pass on Tobiramas teachings.He can also eventually show the Kekkei Genkai emerging "accidently".
Aburame clan does not have a bloodline limit. They make an agreement with the bugs to share their chakra and get to use them for their techniques. Also the Nara, Yamanaka, and Akamichi clans don't have bloodlines. They are clan hidden techniques. The reason they can not be copied by Sharingan is because the user of the Sharingan needs to have an understanding on how a technique works and in some cases a related affinity