Although it is said that it can't be helped because it is a serialization, the convenient retroactive setting of "the hidden past"...
And Caesar... unfortunately.
Serialization often brings about certain challenges and limitations. In this case, the addition of the "hidden past" as a setting might seem a bit too convenient. It could potentially be a way to quickly add depth and mystery to the story without fully developing it from the beginning. However, it still has the potential to be an interesting plot point if explored further.
As for Caesar, it's a pity. Maybe there was more that could have been done with his character. Perhaps his story was cut short or didn't develop in the way that readers had hoped. But that's the nature of serialization sometimes. Things don't always go as planned, and characters may not reach their full potential.