I use 'chicanery' here in the motor-racing sense of trying to get from A to B by making some deft steering manouvres. This is what Right Reverend Dr Glenn Davies appears to have attempted in presenting the Sydney case for the legality of its synodical decision to authorise diaconal and lay presidency. Smart racing drivers do not drive into obstacles but around them so it is interesting to read that +Glenn offered no arguments in favour of lay presidency. But his attempts to justify diaconal presidency involve chicane driving around the words 'administration' and 'assist'. But to no avail. The Australian Anglican church has waved the red flag.
You can read about it briefly here at Thinking Anglicans (and then links to news media reports), read the Tribunal's report here, or read all the Tribunal's reports here.