If this is true, then my last DD that I posted some seconds after you posted your post, then my DD was partially true.As Lat4 in your example is not completely in shadow of Lat1, Retro activates on Lat4 onwards. Lat5 closes inside Lat again, thus killing any Lat4 BO. So any Waits before Lat4 remain in effect.
-> If bar 4's close had been inside the LAT BUT its leg 3 had been the same as it is here, retro would also be activated, onwards.
There is just something a bit curious I see in what is said here, as retro really echoes to the past, not onwards.
Strange for the now in my mind, but it's ok, thank you for that help @Simples !