ah I see.
It is common for a logo as the main visual identity of a company, to have a few of its design elements (the color compositions, the shape, the font choices, etc.) to be used as part of the other visual identity components, such as on business card, fliers, web header, letterhead, envelope, etc. It's important to have consistent design for each of the visual identity component.
Alright, thank you so much for your comments, and given ranks to my design proposals so far!
~ A u d e e