Reminder that Simon has admitted to having speech problems and not speaking much at all during his first year
Reminder that Simon tends to communicate non-verbally, through shrugs and gestures
Reminder that Baz said that whenever Simon does talk he trips over his own words more than anyone else he had ever spoken to
Reminder that when Simon was with Baz and Penelope he would often let them do all the talking
Reminder that after the Mage died Baz said that he and Simon would often sit together in silence
Reminder that Simon is probably not a very talkative or loud person given his history with speech problems
Reminder than Simon probably has a speech disorder like developmental verbal dyspraxia or Alalia or possibly even selective mutism