The six hour fourth day just doesn't make sense to me. You still wake up and start the day at the same time. You work longer your first two days and because of the 10 hour rule between shifts you're at the facility later on your third day. It will also force additional afternoon and late evening coverage.
If you're going to force people into working more than eight hours in a day and rest was really a priority, I think 4-10s with an RDO before the MID would be better for everyone.
Example... E, E or D, D, RDO, Mid, RDO, RDO.
You could even do straight shifts on your first three shifts and never worry about a quick turn. If done right, the overlap of the 10 hour shifts will help with most staffing coverage. I know management, and some on here, will point to more OT but that's going to happen regardless. By staggering all these shifts to cover a six hour day, it will make an already tight schedule for most even tighter. Less people will be eligible to work OT and 2 hours assigned on the back or front will be the norm. That 1530-0030 shift is now 1530-0130. That 0600-1400 will be 0400-1400. If you're at a Z working a Mid, be ready to take more airspace because facilities will be ATC-limited/0 often.
I understand NATCA should be in favor of improving rest and fatigue but this 9-9-8-6-8 aint it. Furthermore, NATCA should be fighting that if the Agency wants to standardized working more than 8 hours in a day, an extra day of REST will be given during the week. Isn't that what this is all about, fatigue and rest. Pitching this schedule is just smoke and mirrors for the Agency.