His kit feels more like a breach than an entry duelist. His entry is ass with his wall. He can't really set himself up as well and he would if he was sitting back like a breach (vulnerable/wall) and his double tap is kinda hard to get.
iso is a not really a primary duelist it feels like. he is a team utility combo character with half of his abilities it seems, then very frag focused with the other half. . but that second half of abilities is why he is named as a "duelist"