I noticed a mistake in my analysis of Update
#3. So this is a revision or at
least new analysis having to do with the same game/line.
The game is Halwick Jr - Morgado, W1998F.001 IECG email, 1998.
The whole line for White with 8. c4!? is complicated with lots of candidate
moves for each side.
Hopefully the line will be "tested" in actual play.