User blog comment:LeeeeeeeroyWarudoooooo!/Hunter X Hunter Most Powerfull Characters/@comment-14902757-20140622011713/@comment-24287488-20140623055635

I believe Netero only asked Zeno for the mission because he was his very old acquaintance, and a very powerful experienced assassin who is able to deal with unexpected and unpredictable situation (as we've seen at the time of infiltration) and not to mention Zeno was heavily paid for that separating the RGs mission. He could've not asked Chrollo for that job who is more powerful than Zeno.