OP,
IF Sasuke does absorb Naruto's rasengan than it's not a rasengan vs chidori clash because those jutsu are not clashing. A rasengan vs chidori clash is when those two jutsu clashes with each other. If anything you just proved Sasuke can't win a rasengan vs chdori clash because he has to remove the rasengan to win.
Sasuke's chakra is stronger than Kyuubi. Kyuubi stated Sasuke's chakra is more sinister than his -
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- When Kyuubi talked about Sasuke's power he was referring to the power of his eyes.
If Sasuke chakra was more powerful than Kyuubi then should he have won the previous Rasengan vs Chidori clashes.