Thanks! I've wanted to be on the forum for a bit as well, so its not all just asserting his impending crewmate status, but thats a big part of it. Ever since it was revealed that Kizaru was heading to egghead I anticipated him being a crewmate. Its only been confirmed more and more throughout the arc as he shows hesitation and a dislike of the orders to kill his adoptive family, and a major theme of the arc being people fighting back and regaining their agency even after being under control, as with Kuma snapping out of his programming and heading to save Bonney.
A salaryman being liberated from apathy by Luffy and co is incredibly thematic to the whole story, where Kizaru will take control of his own life for once and act on his own desires, defending Sentomaru and Vegapunk, making Unclear Justice clear, and then becoming the light to Luffy's "Sun".
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Hell, even before that after it was revealed to me in my reading that Kuma was an ally and Aokiji left the Marines, I've been vaguely anticipating a Kizaru betrayal, as his personality and past dealings with the Strawhats have shown that he is a very disaffected person who does what hes told, but likes leaving it up to chance. Do one's duty but leave it up to fate what happens to them instead of outright confirming kills, like with Sabaody and Marineford with sniping the key out of Luffy's hand. It is true that all of this could VERY MUCH be attributed to plot armor where of course Luffy isn't gonna die, but still.
The crew's darkest moment of despair and separation ending up where all of their foes in that moment would later turn out to be allies would be ironic and an incredible moment of serendipity and proof that theres still good in the One Piece world, Kuma, Kizaru, Sentomaru...