On dCore-trusty, I loaded e20 and ran it with "enlightenment_start" in /etc/sysconfig/desktop. Exittc works fine here, below is my path, and /usr/bin is not ahead of /usr/local:
/home/jason/Applications/.bin:/tmp/tcloop/e20/usr/bin:/home/jason/.local/bin:/usr/localsbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/bb:/etc/sysconfig/tcedir/ondemand
I also made a wrapper to use enlightenment with the "-i-really-know-what-i-am-doing-and-accept-full-responsibility-for-it" option and path is same as above.
jls - is the E related files in /usr/bin symlinks as normally installed by sce-load, or are any real files been copied over?