I second the previous post. It took UA gate agents a while (6 month?) to fully implement "elite bypass" concept. When it first started, both GA/pax were confused, and this resulted in a lot of annoyed posts on Flyertalk. Have some patience and it'll be sorted out soon enough.

It would make sense to always board for F/C and elites via Breezeway the whole time, and Y plus non-elites through normal queue, so there's less confusion. If F/C and elites were further differentiated and called up one group at a time, as UA does, it won't get too crowded. Maybe something like F/Plat -> C/Gold/ST Elite Plus -> Silver/ST Elite.

Once F/C/elites are done and Y/non-elites starts boarding, the Breezeway will be empty most of the time. Because of this, even though DL allows all elites to use Breezeway, it won't be a problem, as some have suggested.