The Gwen+Trent letters and Trent's grandpa facts are not the only ones!
Here, you can comment and post 9 (or more) facts about it.
FACT 1: In season one, 2 campers returned, and Trent finished in the 11th place. 11-2=9
FACT 2: Cody also loved Gwen. And he was eliminated in Episode 9.
FACT 3: Besides Trent was the 10th to arrive to the island, Chris said he was the ninth!
FACT 4: He's the ninth camper to jump in Episode 2. (Beth and Noah were not seen jumping).