I can't see him absorbing amaterasu at all. It might be possible for him to break out of genjutsu with samehada, i guess similarly to how a perf jin can break out thanks to their tailed beast.
But yeah, he's not absorbing amaterasu bro. We've seen him absorb bees lightning tech and thats it. There's no evidence he'd be able to absorb amaterasu, which is far from a normal elemental attack...the flames literally can't be put out unless sasuke does it himself or the target finishes burning. How is he going to absorb this?
Kisame absorbing a lightning tech isn't evidence that he can absorb any and all element techs(we've seen him absorb 1 lightning tech, that doesn't confirm he can absorb any level of all element attacks) including the ridiculous OP amaterasu, that probably wouldn't happen bro. If he tried he'd probably just be roasted...
Anyone who is logical will tell you that you're wrong man...
BTW, with EMS Sasuke actually CAN spam amaterasu, we've even seen it already.
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He literally just burned like 10+ zetsus in 1 shot...