Your point's a good one, BUT look how Derek Ferguson has grown into the job - never the most articulate but always an enthusiast, and thankfully never sent to Ibrox by the BBC. Covers Hamilton, Motherwell and Thistle pretty well - I even heard him use the word 'aforementioned' the other week. He was slated for being inarticulate when he first came on air. As was Ryan Stevenson, who also went on to be reasonably decent before going to Australia. Until you actually do the job.......
Commons and McDonald are both articulate people who will hopefully eventually take the place of the 80s relics Miller and McLeod, so no issue with them cutting their teeth right now. If they have the odd wobbly moment, then so what? We've all had them in our jobs.