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Since Dann knew that he is currently living his new life in onepiece world he knows that he needs to be strong in order to survive in this world. So he began to train his body little by little in order to shape his body untill at least he can fight back to keep his lives. He tried saitama's method of training with 100 push ups, sit ups and running for 10km each day on the beach by running in circle around the island.

Someday when he trains on the beach he saw 2 giants sea creature emerges from the sea and fighting in the middle of the sea. Those giants creatures fights to the death and the winner ate the loser body. When that happened finally it clicked on his mind that the island where he is staying right now is in the middle of the legendary calm belt. When he realize he was on unknown island in calm belt his hope to get rescue vanished and he cries for his shitty luck on this new world.

He knows in order to survive he needs strenght but he can't escape this island since even if he build some scrap boat to sail he won't go anywhere since the boat can't sail on calm belt where there are no waves or wind in order to make the boat sail. The only way out is by swimming just like how he read on onepiece manga where reyleight can swim on calm belt but since he already ate a devil fruit his hopes vanish. So he tried to train his body to withstand sea water by dipping his feet in shallow water first but the strange thing happen to him since he doesn't feel weaken by the sea water. He got confused since he knows that devil fruit users are all weaks to sea water and sea stone. So he tried to go to a deeper water but still got his head above the water he still feels the same not weaken by one bit. Finally he tries to swim and he dive in to the water. When he realize he can swim on the sea he got so happy and swim around the island but not too far since he doesn't want to get eaten by the sea kings around the island.

After that he continues his training while thinking is there something wrong with his devil fruit. Since the day he ate the fruit he never use it's power since there are no one on the island that he can use to it. So he wonder what are the power of his steal abilities to maximaze his power. Is the steal ability only work on human or can it even works on anything.

Dann tried to use his steal abilities on the fish that he caught on the river.in order to use his steal abilty he needs to touch the objects. The moment he did that he knows he can basically steal anything the fish has to offer. That includes it's ability to swim, breath under water, knowledge of the sea map from the fish point of view and even he can steal the fish strenght and lastly he can even steal it's lifespan. Dann got so excited that basically his devil fruit power is so great and awesome that he can become an immortal as long no one killed him or he never got sick in his lifetime just by stealing every living creatures lifespan that he encountered.

Dann even tried to use his skills on unliving things like rocks. When he did that he got suprised since he can steal the rock's density. Basically when he steal the density of the rock his body's density also turn in to rock but still has the human skin appereance. From that moment onwards he start abusing his skills on everthing in the island. He stole the lifespans from the trees, knowledges about sea from the fishes and hardness from rocks.