First of all, Ecatomb is NOT PWI.
Second, Ecatomb is NOT EPW.
Many things on Ecatomb are good help,
but there's no obligation on either side here.
For PWI I'd consult their Encyclopedia (ingame, button on mini map),
or maybe PWIwiki, or compare with pwdatabase...
For EPW I'd go to EPW forum -> Guides.
If EPW Guides are incorrect, suggest corrections to Epic.
If Ecatomb is not correct, go to Ecatomb with suggestions
to correct themselves (bear in mind that their goal is
PWI accuracy, not EPW).
That's the best I can offer you right now. Hope it helps.