6:5 does not contradict 6:2. These are different points of view - In 6:2 the deprecating villagers are amazed by the healings calling them mighty works, perhaps in comparison to no works previously done at all, but Mark knew the rest of Jesus' miracles and by comparison to the few healings, recognized that no truly mighty works were done there.
6:5 does not contradict 6:2. These are different points of view - In 6:2 the deprecating villagers are amazed by the healings calling them mighty works, perhaps in comparison to no works previously done at all, but Mark knew the rest of Jesus' miracles and by comparison to the few healings, recognized that no truly mighty works were done there.