It's very steep snow/alpine ice, but it's not "vertical," therefor, purely ice tools are not needed, and it can be done with a single non-technical general mountain ax. That doesn't mean you SHOULD take a basic ax, and it doesn't mean YOU wouldn't benefit from two tools, be they technical tools or piolets. It is a long route, though... keeping weight down is the crux.
Next time I attempt this route, I'll likely take a lightweight piolet and a 52cm Petzl Sum'Tec hammer.
The second tool will stay on your pack for 95% of the climb, so you want it to be about as light and compact as can be. It will add a huge level of comfort and security during the steepest sections.
My 2 cents.. good luck
where am i going... and why am i in this handbasket?