I'd have to say, perhaps Crow or Jack, seeing as they're his closest friends. However, I'm more inclined to say Jack, since he was also experimented on by Divine, and he didn't help Yuu out after his Signer-boom after the Kiryuu incident. This could be his way to make up, I suppose. Jack, I think, had some insecurities with his bond with Yuusei after the whole stealing Stardust and your D-Wheel thing, because even though Yuusei forgave him and all, I'm inclined to believe that Jack wasn't entirely sure about that. :o
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I'd have to say, perhaps Crow or Jack, seeing as they're his closest friends. However, I'm more inclined to say Jack, since he was also experimented on by Divine, and he didn't help Yuu out after his Signer-boom after the Kiryuu incident. This could be his way to make up, I suppose. Jack, I think, had some insecurities with his bond with Yuusei after the whole stealing Stardust and your D-Wheel thing, because even though Yuusei forgave him and all, I'm inclined to believe that Jack wasn't entirely sure about that. :o