The clone cameo had a deeper meaning than many viewers realized. Because Kenobi had hidden himself on a remote Outer Rim planet, this was probably the first time he'd encountered a clone trooper since Order 66. He'd have recognized the distinctive armor at a glance, and known the odds were high this particular clone trooper had served under Anakin Skywalker when his former apprentice led the attack on the Jedi Temple. Obi-Wan never knew about the inhibitor chips, meaning he had no way of knowing the trooper had no choice. And yet, for all that's the case, he chose to give his fellow Clone Wars veteran some cash. He felt sympathy, recognizing they had been both brought low by the Empire.
Even beyond Obi-Wan's pathos in the face of trauma, however, the clone trooper cameo also concealed a deeper tragedy. As Lucasfilm note in an official trivia gallery: "Temeura Morrison's cameo as a veteran of the 501st Clone Battalion shows not only a decade of neglect and despair, but also continued growth acceleration coded into the clone's biology. This genetic manipulation makes him appear far [older] than his 20 or so chronological years would suggest." The clone's aging underscores the tragedy of the Clone Wars. Technically, the clones were the ones who won the war; the Separatist army was vanquished, and Order 66 meant they were the ones who took down the Jedi. And yet, for all that is the case, they were only ever pawns to the new Emperor.
After the Clone Wars, the Empire swiftly stopped using clones, instead pivoting to a massive recruitment initiative across the galaxy, and it's likely the artificially-enhanced ageing was one reason for the decision. Clones were expensive to produce, and they wouldn't remain viable for long. Worse still (from Palpatine's viewpoint), some clones rebelled against Order 66; Star Wars: The Bad Batch season 1 further suggested the inhibitor chips' influence degraded with time, potentially making them all the more unreliable.
It's always seemed odd that so few clone troopers were active in the Rebel Alliance. Obi-Wan Kenobi episode 2 serves to remind viewers why that is the case; because clones aged incredibly quickly, and few would have survived until the time of the Galactic Civil War. Tragically, that accelerated ageing may well explain why the Empire felt so comfortable tossing them aside; they knew the clones would soon be gone, removing a potential source of well-trained rebels. And so the greatest army in the history of Star Wars vanished within just decades, with only a few tragic tell-tale signs of the sort seen in Obi-Wan Kenobi.
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