of course you can level another BO if you want.

If the kagero BO is going for gun line, get it now.

Lv12 Kagero
Lv16 akitsuki - ok
Lv22 akitsuki-kai - very good
Lv24 tsukikei - very very good


*You don't have to worry about resell value right now(you get 95% back for national DD).

you could, but its better to get fubuki first to train other BOs

Couldn't i just train another BO and get both?

oi oioi

it depend of what ur battle style....

if u like using gunner u should go to akit

and

if ure like using top wait until u got fubu

remember once u choose the line there is no turning back

alwayz get it asap. theres no benefit waiting any higher unless your waiting for the fubuki at lvl 19.