This "Evasion Defender Tanker" is useless in a small somewhat novice party. By evading the monster, that monster then might attack the other party members. In a large party, evasion defender might be viable, but in a small party, it is too dangerous to the other party members.
Besides monsters, an evasion defender cannot block missile weapons or other thrown objects. Those objects or arrows then go on to hit the other party members. Thus, an evasion defender, when in a party, is very similar to a coward that dumps monsters and missile attacks onto the other party members.