Though, I wonder why Chot didn't try sending to Suntop whether or not they had picked Jethel up with the Palace. I know his sending abilities are limited, but Suntop in the Palace would have picked it up anyway.
Besides just: It's for story's sake ...?
Sending is a vital part of Wolfrider life, a natural reaction for them - especially when they are in trouble or stressed. They don't have to think of sending - they SEND.
Go-Backs, even after they've learned to send again, don't have "taken it in" as a selfevident tool. Some of them may even object it. Considering Chot's temper and his current state of mind - he was simply not thinking of SENDING.