Glad it helped

From /etc/passwd:
root:*:0:0:Charlie &:/root:/bin/sh
admin:*:0:0:Admin User:/root:/etc/rc.initial
Root's shell is /bin/sh and has a .profile that calls /etc/rc.initial, but things like scp can still bypass .profile and execute another command.
Admin's shell is /etc/rc.initial directly, so it is locked into running that on each login.