I still almost exclusively play pure purple kaido, and have since ST01-04. One strong tech option to consider is the FILM deck Douglass Bullet. He is an 8cost for 10k - and his ability let's you tap Borsalino and Fukaro if your 9 or 10 Kaido can't kill them. With Onigashima, you can even do some fun, nixhe things on 10 Don like use Bullets effect to Tap 2 blocks, gain double attack, Onigashima to go back to 7 Don, then use Kaido leader ability.
I think that the 7cost king is so much better than the 6 cost king in the deck because it synergizes with Black Maria and ur leader ability so much better, and it’s a rusher
I’d consider adding a few copys, but no way I’d completely swap out 6 cost King. It’s your best play going first after Onigashima on turn 2. Also it’s just a great card against RP Law as it KOs a 4 cost and has 7k statline which is really awkward for them to remove.
If you’re talking about the turn I played her on 3 DON it’s actually not free. The 5 DON from Black Maria puts me at 8 and after leader DON -7 I would be back at 1 DON which means I couldn’t play Kid next turn.
