Descender question and dottore

I ask this because I saw a bunch of people that said or agreed that 6.3 dottore with the 3 moon marrows (moon sisters power) is DESCENDER level (but dottore said that the authority of the shades come from the moons, that makes him more far stronger than descender level, even high dragon -low shade power), but the current traveler is a DESCENDER and he couldn't or can't defeat arlecchino which she is low-mid archon level or high vision bearer level. Maybe descenders power is random.