On one hand, yes, I checked how long Yamato was in her hybrid form, and it wasn't 1 chapter lol.
On another hand, Imu's been on Elbaph for quite a long time, and he mentioned that his time is limited. So I would expect the fight to wrap up rather sooner than later, so maybe we just get 1-2 chapters of hybrid Loki.
We still need Zoro & Sanji fights to conclude properly before Imu is defeated. So I agree, there should be more panels with them.