organic chemistry - Do indigo and leuco-indigo have fully conjugated pi systems?

I've just come across a figure indicating the positions of conjugated bonds in indigo and leucoindigo, and I'm quite confused about why both molecules aren't fully conjugated.

My reasoning is as follows:

1. Both carbons above and below the bond are sp² hybridized and have π electrons.



2. The carbon to the left is sp² hybridized and has π electrons, and the nitrogen to the right has a lone pair.


3. Same as 2.


4. Same as 1.

I also want to ask about why leuco-indigo isn't planar. According to Wikipedia:

In indigo white, the conjugation is interrupted because the molecule is nonplanar.