If we believe that your team stat totals is strongly tied to the enemy team stat totals (and hence the max arena score per battle), it is possible that through leveling your team or changing your team composition, you're less likely to see Takumis. Or it could be simply due to rng.
I'm still seeing plenty of Takumis and I'm leveling another unit to potentially help me with my Takumi/Robin/Hector problems.
I'm still seeing plenty of Takumis and I'm leveling another unit to potentially help me with my Takumi/Robin/Hector problems.