Elder Patrick Ketchum from Indiana was in the CCM at the same time as Christopher. Here are some nice things his mom forwarded to me:
"Tell Sister Knorr what a wonderful son she has. His Spanish was practically perfect before he even got into the field. And I don't think that any missionary at the CCM was so sought after for doctrinal answers as Elder Knorr. In addition, he can sing any part in any song, anywhere, anytime! I always tried to sit next to him so that I could mimic whichever part he was singing and learn how it was done! He is one of my best friends here."