no 1st wave sequenced is prepped into frame, just split into bundles/loops and prep rest as usual to have 2 bundles for same addresses, guessing it saves around 6/7 mins per tub of sequenced mail and means trusting the machine to be 100% right, i reckon 99 out of 100 tubs i prep has at least 1 missort in,
then add 1 lot of households, (surprise surprise 1 didn't have any on a visit to see how its done) meaning you carry 3 bundles in your hands for the same addresses ,
now how does that system work on 3/4/5 different lots of households? officially they cannot be nested, unless come already prepared as in 1 trial d/o, which is a good idea to save time/money
even having 1 bundle "back to back" will be impossible with loops also getting households that day, and will slow us down drastically on the streets, but hey, you're out of the office 15 mins earlier so now time available for lapsing
honestly don't know who dreams up these ideas, if current method isn't broken, don't try to fix it