I got WB asuma and he is only good in 9 tails imo so i dont like him as much as other ninja that boost like iruka who are usefull outside of 9 tails.

Refines are not even Just about initiative its about take less dmg from crits and criting more yourself etc Wind asuma can be farmed from survival i wouldnt * gold on him just get bits from event a bit from survival he isnt exactly the kind of ninja thats game changing. Refines if you got lots of money is much better investment.