Some high profile riders had contracts that permitted them to ride their eponymous brand in certain races. Generally, one of these was the World Championships because it was contested by national teams and not trade teams. In other words, since Lemond wasn't riding for ADR-Bottecchia at the World Championships but Team USA, it wasn't as important to have him on a Bottecchia. However, since Lemond was contracted to ADR-Bottecchia that year, Bottecchia still got to use the 1989 Campione del Mondo palmares decal on their bicycles. Clear as mud?

Often, riders with eponymous brands also had contract clauses allowing them to ride their own brands at events on their native soil. For instance, I have several photos of Steve Bauer riding his own brand of bicycle at Canadian events, while he was under contract to la Vie Claire.