Arena is a not easy, even for p2w. Barely got to sixpath with near 16k initiative ! Kage or super kage is what most of the people will get. If you are lucky you could get 6 path with very low power and initiative(saw a 38k player getting 6 paths). There should be some incentive to pay right, like winning matsuri and arena.So, don't expect to win everything as f2p.