Oldgit, Was it Simon Richardson of Sigma? I think you have a point re. a fit person surviving in a pro peloton. You only have to see the standard of the guys at the back of the Tour Series races (ie. those that are merely surviving rather than competing) to know that it might be possible.
Not so sure about surviving at Tour level though. From reading about the experiences of some our domestic teams competing abroad in 2.2 races it seems a big step up from British racing.
I hear you on the transition from bunch to break being massive. My first ever crit at Castle Coombe was a sharp learning curve. My ten second mini break where for a moment I felt king of the world riding along to the Chariots of Fire music soon saw me swallowed up with my arms and legs feeling like lead. Honestly I was so dead for the next few minutes that when I tried to get out of the saddle to pedal I nearly fell over the bars.
Never fails to amaze me how 98% of the peloton refuse to do any work or even entertain the thought of a breakaway in a Cat 4 race despite the fact that only a handful are good enough to contest the sprint.