Getty Images Cleveland Browns rookie Dillon Gabriel will be the primary backup to Joe Flacco. Dillon Gabriel is set to make his NFL debut with the Cleveland Browns on Sunday, and his fiancée, Zo Caswell, will be there to cheer him on. Gabriel was drafted in the third round by the Browns after a record-setting college career at Oregon, Oklahoma and UCF. He’ll open the season as Cleveland’s No. 2 quarterback , behind 40-year-old veteran Joe Flacco . Gabriel and Caswell have been together since