So basically... You don't want to bring KA into the fight because it puts Sasuke at a disadvantage.
If it is part of Danzo's repertoire, then we HAVE to use it in a fight scenario. He also could have used Izanagi with it.
Danzo was also fighting Sasuke while having Karin analyze Izanagi, so no he didn't come up with Intel by himself.
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Danzo was also holding back in case he had to fight Obito afterwards.
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You also forget to state that Karin had previously healed Sasuke before they fought Danzo.
Naruto essentially killed the 3rd Raikage...
Had he not been an immortal Edo he probably would have died from that wound if not been gravely injured.
Zero intel? He fought Itachi, his BROTHER. I'm pretty sure reading the Nanako shrine and learning about the abilities of the MS considering that you have the same Kekkai Genkai as your opponent doesn't mean ZERO intel.
He also researched how to beat Orochimaru.
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So.... All in all Sasuke basically has ONE completely fair fight and that was against Deidara. This COULD be debated because Suigetsu summoned Manda from him, but Sasuke had enough foresight to see that it was useful to do so. We'll let it slide.