Fair enough, and that answers it. Though for a project like this it leaves the slot ambiguous rather than filled, because I would want a date on it. I do not think the corporate mark stayed identical across the whole run of Central, and if it moved at all, the honest entry is the logo of the year rather than the logo.
Same problem I had with my dock, only this time it is the company wearing the different faces.
The Legacy Software page explains the gap as well. It lists the software, and Central was the thing that delivered the software, so it was never going to appear on there. Anything in that category has to come out of people's memories rather than off a page, which is the argument for collecting them while the people who ran them are still about.