Turbine D
To clarify, I describe the roots and root walls as inside (radially) the Vanes Platform, to provide the same as you state, a fairly undamaged Root system.
This is a new architecture in the 900. The Nozzle Guide Vanes on the TRENT 700 (Edelweiss) are placed directly opposite their IPT Blade counterparts. With a fully fractured Drive Arm (Circumferential), the 700's Blades immediately effaced (rubbed) the Vanes, and slowed the IPT. This is regarded as the event that prevented an otherwise catastrophic burst. It is also thought that not only did the Blade/Vane effacement slow the wheel, it stabilized it, preventing further aft travel and chaotic loss.
In your opinion, what are the design/operational advantages of the "New" architecture in the 900??