just mentioned saki because she's a black (instant deploy assassinating ranged unit in a melee slot, and somewhat of a mini-tank due to her 50% dodge). bashira relegated to a later leveling spot simply because nanaly and spica are already up, and under general situations there's less urgent need to triple archer, so I opt'd to recommend units to fill up the other gaps first, as well as further leveling on useful units that are slightly lower level. bernice is in a similar situation with bashira; there's gellius and maribel, so bernice is not likely to find great use until AW comes where she'll be one of the more important units you'd want AW'd first (not the most important few, but she'd be higher up than bashira for sure).

well, frankly speaking the order is likely to change if I knew what the other units in your lineup are (e.g. if you have kerry and/or other valks, elaine would be pushed further down)