I'm not sure who is making decisions over at Upper Deck, nor that we should take them all that seriously, but our blog needs a post and I found this story.
You are reading correctly. Of the players chosen for Upper Deck rookie cards, two of them are Leafs; Jared Cowan was the lone Senator.
Here is the complete list (as near as I can tell) of Upper Deck rookies:
John Tavares, Long Island; Victor Hedman, Tampa Bay; Matt Duchene, Colorado; Colin Wilson, Nashville; Tyler Bozak and Jonas Gustavsson, Toronto; Jared Cowen, Ottawa; P.K. Subban, Montreal; Bobby Sanguinetti, New York Rangers; Logan Couture, San Jose; Mikael Backlund, Calgary; Eric Tangradi, Pittsburgh; James Van Riemsdyk, Philadelphia.