Training multiple people with Botany/Scouting

[soloms]

With some of the skills it is clear to me why I would want to train all possible characters in them, but others I am not sure what I gain. In particular Botanist and Scouting it is unclear to me what the advantage is for me to train more than one character in them. Does anyone know?

[Indinera]

In fact those are skills you may want to select just one character for the training.

[soloms]

Thanks