I didn't care for Kellogg when he first got the cbs gig years ago. Back then he spoke like he had a foreign object, like a large marble, iin his mouth. But he has become more polished over time.
Bill Walton had the same problem when he first started doing color commentary for WCC hoops games on the old Prime sports network in So Cal years ago. BW would stutter, spray and utter some of the strangest things when he got frustrated. But he has also improved dramatically from those days.