xautolock has RDEPEND="|| ( x11-misc/xlockmore x11-misc/xtrlock )" This pulls in xlockmore, although I use x11-misc/i3lock as a locker and don't need xlockmore (or xtrlock) at all. See also 347729, which requests alock and slock to be added to xautolock RDEPENDS.
dependency added. Thanks for reporting