Routing FX question.

Hello Cubasers.
I have set a mono delay FX track with a mono plugin, sent to a mono track and I have noticed that on top of the FX track window it displays (mono->stereo).

At this point I have checked a stereo FX track to see what was displayed on it and it was (stereo) only:
Why the mono one has (mono->stereo) and the stereo one has (stereo) only and not (stereo->stereo)?
Since I guess that ->stereo is the stereo out.

In addiction, what exactly happen if I route a track to No Bus?

Thank you.

Quite obvious:
the mono track is mono in -> stereo out
the stereo teack is stereo in -> stereo out

Then the ouput routing is disconnected.