While he lived, he was full of schemes with endless fallback plans; even after death, the various covert contingencies he left behind during his lifetime continued to play their part.
Using Susanoo to reverse the outcome of his battle with Sasuke, using the Totsuka Blade to seal Orochimaru, and after the Impure World Reincarnation, facing the combined force of Naruto and Killer B, he unexpectedly used his fingers to execute an impressive conventional genjutsu the moment they averted their gaze from the Sharingan, dealing the two of them a heavy blow.
And his other contingency—Shisui's eye, buried inside Naruto's body as the final insurance policy to plot against Sasuke—had taken effect, triggering upon sensing Itachi's Dojutsu Power and thereby breaking free from the Impure World Reincarnation, after which yet another trump card, Izanami, defeated Sage Kabuto—
His fallback plans were so numerous they were virtually inexhaustible!
Uchiha Gen similarly intended to start keeping some trump cards for himself.
Back when he was weak, facing battlefield threats and Uchiha Madara's conspiracy, he had to grow and become strong as quickly as possible, forced to continuously toss out those newly learned ninjutsu and newly acquired Character Card abilities, step by step revealing these newly obtained cards just to survive in such a crisis-ridden situation.
Now that he already possessed enough self-protection ability, a new skill like the Multi-Shadow Clone Technique—if taking it out could not directly raise his own strength by a large margin and achieve overwhelming dominance—was better kept hidden to create an intelligence gap, making it much easier to achieve results at a critical moment.
"Clang!"
A crisp sound of clashing metal rang out, and the black-bodied, white-bladed Sengoku Ninja Sword swept from top to bottom, easily snapping the standard-issue longsword in a Kumogakure ninja's hand and smoothly slicing across