The short part is to allow Ninja Masterminds to slot Running IO sets in the Ninja henchmen.
The reasoning behind it is that they can already slot the SOs for running but in most circumstances this won't help or isn't optimal. IO sets would open up both runspeed + endurance IOs and also stealth procs for the henchmen. It would seemingly make sense with them being ninjas and I can't think of anything gamebreaking about it off the top of my head but if there are problems I don't mind discussing it.
...Other than this sounding completely silly, I see no reason why not. If Ninjas are runtastic, let them be slotted for faster running and for the Stealth proc.
The short part is to allow Ninja Masterminds to slot Running IO sets in the Ninja henchmen.
The reasoning behind it is that they can already slot the SOs for running but in most circumstances this won't help or isn't optimal. IO sets would open up both runspeed + endurance IOs and also stealth procs for the henchmen. It would seemingly make sense with them being ninjas and I can't think of anything gamebreaking about it off the top of my head but if there are problems I don't mind discussing it.
-----
Mission Architect Handyman