It is also about changing options to communicate. If Dylan originally texted friends on his cell phone, why switch to the iPod Touch? Did the battery in the cell phone go dead? Did the cell phone get damaged? Did the cell connection stop working? And why only one text from the iPod? Did the connection stop working? Did no one reply, so he stopped texting? Did the iPod get damaged? Did either or both get taken away from him, that night or the next day, by anyone? Did he need to use the iPod to text another Mac system with iMessage to avoid SMS (texting) charges?
For myself, if I take each option and add them together in different ways, I get possibilities of what might have happened, and why Dylan might not have communicated the next day. Some make more sense than others. By the time I finished (several months ago), I could not come up with any reason why Dylan would willingly stop communicating with everyone, with both devices, short of something happening to both devices, not having a charge cord for either and both batteries went dead or something happening to Dylan.
That is the sticking point for a lot of people. What 13 year old wants to text badly enough to change texting devices, yet stops texting altogether at 9:37 PM without starting again the next day?
Sorry for long winded response. But it did make me think about the possibility of needing to switch to the iPod for iMessage capabilities.