the ant arc was after the greed island arc, if I remember correctly, Gon and Killua were more powerful in the ant arc. Gon's search for his father isn't the main story I believe. There's also Kurapika's hunt for the Spider group.
The spider group was part of the arc before greed island? but the spiders arent exactly gone so i guess hes still searching... but gon's main objective is finding his dad...
but there are four main characters, Killua's story hasn't been delved into much, there's also Hisoka and Gon's final battle (I assume) and Kurapika needs to kill-off the entire Spider group, then there's Leorio who isn't really doing much. I wonder what other clues will Gon's father leave him..
Well gon is the main so im assuming his story is also sort of the main story with everyone elses kind of sneaking in... no idea what that doctor is doing... he isnt even around... killua hmm... he will probably be around gon for a while and he is supposed to be the next leader of the assassins soo... yeah xD Gon also screwed up his future in the ant arc if that actually did anything?
how was he screwed? I don't think Gon is actively searching for his father, he goes whenever there are rumors are clues otherwise he goes off at random. Killua is in line? not his older brother with long hair and dead eyes? the doctor appeared for some time during the York New City arc
Gon became a hunter just to find his dad... the greed island arc was all due to his dad leaving him the game data in the box and the ant arc was cuz his dad was screwing with him xD Gon wasted his "future" or whatnot in the ant arc?
Killua is next... hes supposed to be the most powerful or have the most potential anyway...