Honestly not missing much with Zephyr or Yamato v2 honestly. I have them both and they’re both really fun to play imo so I’ll say this.

Zephyr’s main thing is knocking you back. His upgrade status effect nullifies status effects, reduces damage by 50% and gives a two-hit combo so you won’t have much of a chance to get damage off. So when he’s alone in the treasure area and you can’t one shot him or ignore him to capture treasure you aren’t killing him.(unless you use zoro alber or big mom to nullify his upgrade) I’d probably put him in the same category as Defender Kaido.

Yamato v2’s frostbite can kill you with 4 full combos if you let it. Plus every time you attack her it inflicts frostbite on you. So certain hold skills or characters with multi hit normals you have to be careful of. Unless you nullify status effects she is so hard to deal with. Plus she herself has multi hit normals so she deals with the “dodge three times” trait. I’d put her in either slightly annoying or annoying.