What is Bill Spiers looking at

On the back of Bill Spiers's 1992 Leaf card, he is shown looking through a small pile of baseball cards.

The card visible in his hand is clearly this Mark Knudson card.

However, behind the Knudson is a card in a sleeve with a "ROOKIE CARD" header. Knudson was not a rookie on this card, so there's really now way to tell who it is. If I had to guess, I would assume Greg Vaughn, as he was the biggest Brewer rookie in 1990 Donruss.

By the way, I bet it's not easy flipping though cards with your batting gloves on.