I can't say for certain, but that sounds about right. I have a memorabilia card of his from his first stint with the Chargers, and I don't remember having any of his other cards. A lot of NFL players get first and second year cards and then nothing. He was a career backup quarterback and since Topps never made massive NFL sets (I think usually 450 cards) with about 1/3rd to a half dedicated to rookies, and the rest to the major stars, there isn't a lot of room for other players to get yearly cards.
I collect Chase Daniel cards, and despite being in the league since 2009, I don't think he's had a card since 2011. He has served as a backup for 3 or 4 teams yet never got a card beyond his second year. There is a chance that some players got cards issued in team sets or something that just haven't been added to the site though.
Royal Card Review is my blog if you feel like checking it out, thanks if you do!- royalcardreview.blogspot.com/
In the process of updating my collection so don't trust any of my lists right now.
