Cron was working all along but I fooled myself. The true problem right now is that all the job output such as error messages or anything else that becomes either standard error or standard output is presently vaporizing somewhere rather than being mailed back to me. I also thought I remembered seeing a message from cron every minute in syslog but that only happens when some job matches the time criteria. Since the Pi has only one working line in crontab, there isn't much to see most of the time related to cron.
It also looks like cron as configured on this Pi doesn't default to off and the kodi issue was a red haring. The real issue is the cronjob output going "poof!" As soon as I figure that out, trouble-shooting will be normal. /etc/default/cron on the Pi is identical to /etc/default/cron on a Debian wheezy system. It's nice to know the Pi is not setup too differently. Anyway, thanks for helping me think on this. Martin McCormick