Just want to say that the japanese BB are great from tier 5 and up, with a small exeption of Izumo. Its still a good BB but takes time to get used to. If you dont plan playing japanese BBs after Myogi than there is no reason to buy a tier 9 Musashi.
Ono other thing, you write that you dont like playing BBs. Than why invest free xp in Nelson? If you are thinking its a funny BB to play since you can burn down things you will just learn the wrong way how to play a BB.