What is the fine-grained topic of the following text: PLASCHKE's column explores the "mystifying" absence of MCDONNELL, currently a sports update anchor on CBS RADIO Talk KNX-A/LOS ANGELES, from the sports talk landscape in the market after his loss of over 400 pounds. Only return the topic.
Mystifying absence of sports update anchor MCDONNELL from the Los Angeles sports talk landscape after his significant weight loss.