The crystal only began to crack once Jigen's body had reached its limit and was literally on the verge of destroying itself due to Isshiki's power.
Just because the crystal was healed does not mean that he was back at full strength. It just means that his condition was stabilized.
Along with that, Amado explicitly states that Jigen's power was still recovering following his fight with Naruto and Sasuke.
"
Jigen was severely drained in that battle against you. This is a perfect opportunity that we won't ever see again."
We have
explicit evidence that Jigen was heavily drained in that battle and his strength had not yet returned at the point of battling Kashin.
How you continue to ignore this is beyond my understanding
and I'm a friggin' extradimensional pig.
No context points towards it being related to Jigen's Chakra. All of the statements involving Jigen being weakened following his battle with Naruto and Sasuke pertain to his body, his physical ability, not his energy. Besides, as pointed out earlier, Jigen was constantly absorbing Naruto and Sasuke's Ninjutsu throughout the fight, so unless he has such shit maximum capacity that he blows his load in seconds, so the idea that the "less than ten percent" was referring to his remaining Chakra is inane.
The Jigen point also ties into the Delta point.