First a rundown on my theory:
Hearts in the Narutoverse are the source of chakra, and people's chakra possess a single elemental affinity which not only allows the individual to learn that specific element easier than any other, but also allows them to use much more powerful techniques with that element than any other. However, Yamato's bloodline limit gifts him with two elemental affinities, water and earth. By utilizing both of these elemental affinities at the same time while performing a technique, Yamato can create trees and various wooden structures. Haku also has a bloodline ability that gives him two affinities, water and wind, which allow his to create ice when he uses the two affinities at the same time.
Kakuzu had 5 hearts with 5 different affinities, and was able to use more than one heart's affinity at a time. Was it a plot device that the water heart was the first one destroyed so that Kakuzu couldn't use wood and ice techniques during the battle (or so Kishimoto wouldn't have to explain why Kakuzu could or couldn't use ice and wood attacks) or would he need a bloodline limit to utilize those abilities?