Announcing a single winner each week makes the prize feel attainable to the entire field, because one winner among many looks like luck anyone could have.
Adept
The hidden part#0673
One visible winner among thousands makes winning feel possible, not probable. Possibility is what moves the field.
A grid of famous partner logos borrows credibility, but a logo can mark an exploratory chat, not a signed deal, and association is spent as if it were endorsement.
Novice
The hidden part#0886
A logo marks contact, not commitment. Placed under partners, a single call becomes an endorsement the reader invents.