During hero and/or some good SS procs, when reaching 0 eclipse energy during Incarnation, DoTs may have 2-3secs left. Even more if you use CDs mid fight and might refresh Incarnation DoTs few seconds later due to previous still having some significant time left.
Also, one more thing I wonder if the dps gain from casting uneclipsed DoT first is really worth it. I mean, when I previously casted eclipsed DoT first I could fully benefit from the crits extending DoT time therefor both DoTs will be closer in time left when I enter next eclipse. Casting non eclipsed DoT first causes me to quite often overwrite a DoT from previous eclipse by its none eclipse version several seconds before it ends because the other DoT already dropped off.