The whole problem is that BW should be close until zone 3 called.
It should be CLEARLY and ABSOLUTLEY closed until zone 3 boarding.
The actual signage and marketing PR says that I can go through the BW when zone 1 is boarding. This is obviously wrong, but am I supposed to just wait while dozens pass me by?
By allowing this bogus usage of the BW, they are creating a problem. Yes, they should just tell the early pax to f** off :-) (OK, I know they can't do that).
SO, they must have an OPEN/CLOSE sign over the BW to stop meddalions skipping over others in zone 1/2.
Other than that issue, I have no problem with the concept.