Arminius did not say the topic was not discussed, he said no Council made it a tenet of orthodox faith.
I looked into this a little more closely. Calvinists hold three views on this; the supralapsarian, the infralapsarian, the sublapsarian. Arminius only mentions the one (supralapsarian) and never the others in this article. Probably because he took the infralapsarian view and made a slight but significant modification (nullifying God's election of men) so that it fit with his views. A good summary (although its a little harsh on the supralapsarian view) of these views can be found at The Order of Elective Decrees
I guess I've never really thought about the order of the decrees. I'll have to look into this a tad more closer.