Why couldn't the Dark Release: Inhaling Maw absorb Rasen Shuriken Technique ? Towards the end of Naruto Shippūden 3: Inheritors of the Will of Fire Hiruko failed to absorb Naruto's rasenshuriken technique.

Dark Release: Inhaling Maw technique is described as a technique which can forcibly extract the physical and spiritual energy of another ninja, even from a considerable distance. Yet it is mentioned that when Hiruko tried to absorb Naruto's Wind Release: Rasenshuriken, he was unable to combine the shape and nature manipulation, and the technique fell apart, meaning the user of this technique has to match the level and nature of the jutsu he's trying to absorb. 

But Hiruko could simply drain Naruto of his chakra, disabling him from using whatever technique he had up his sleeve.

I'm feeling a gap here. Without understanding what happened there,(I can understand Naruto being gutsy, forceful and all), but a forceful ending of the movie would make me feel a bit unhappy ! I'll be glad if someone explains it to me. Thank you. :)
First of all, take all of this with a grain of salt. The movie is entirely filler, and was not explicitly explained anywhere.

When Hiroku tried to absorb and use the Rasenshuriken, the process of combining this specific nature with that specific shape was too hard for him. Remember that Naruto needs 2 additional clones and a significant amount of time to generate a rasenshuriken. When Hiroku tried, the technique blew up in his hand, and he didn't have the time to do anything else.

As for Hiroku disabling Naruto's chakra, remember that Naruto is the jinchuuriki of the Nine Tails, even if Hiroku could absorb such an incredible amount of chakra without being overwhelmed, The Nine Tails' hatred infused chakra is poisonous.

On a more "producer"ish note, Naruto had to win somehow...