I find it rather intriguing that Obito never retrieved his second Sharingan from Kakashi. At the young age of 14, he managed to clandestinely infiltrate the Leaf Village, capture the Nine-Tails, and engage in combat with Minato Namikaze. Given these impressive feats, it seems plausible that he could have effortlessly reclaimed his Sharingan, particularly if he aspired to surpass even Madara's power. The potential of a Dual Mangekyō Sharingan Obito with access to the Divine Tree's power would have been nothing short of invincible.