The Female Paladin’s base Sword Rank is set to D, so she can’t use the Steel Blade, which is a Rank C sword.
As for the Dancers, I pretty much save-scummed until I got the right RNG to get them at least HP, SPD, and either Luck, DEF, or RES with every level up. Granted, I got impatient several times, so I ended up with less HP than what I would have liked, but I can’t pass up SPD, LUK, DEF, and RES from a single level up. Anyway, with enough patience, I got the Dancers to about 30-31 HP, 26 SPD, 18-20 LUK, 8-10 DEF, and 10-12 RES. Probably wasn’t worth it.
As for starting with them at Lv20 with Lv20 stats, that would make the early game too easy, as they’d be dodging everything while also acting as blocks to chokeholds to protect Marriette or other units.
Also, because the first unit I picked to recruit was a Cleric, Merriette definitely had to carry the team until I got my Knight…who is now my most broken unit, because I got the desert map and found a Metis Tome, which I gave to the Knight at Lv8. Other than Marriette and the Dancers’, no unit has save-scummed level-ups.
If you’re curious, I’m still at the Paladin stage, which was extremely easy with the Dancers and a flier. I also found a Secret Seal in the Paladin stage and will be using it on the Knight to turn him into a Great Knight, because screw General and its low mobility. XD
Also, my Cleric almost died, because I didn’t realize that one of the Archers had a Longbow. She survived on 1 HP and is now sitting on the Throne to recover, while I weigh my options on trying to kill the infinitely spawning HURRY UP units who have Killer Lances and Heavy Lances-- the latter of which my Knight will not appreciate.
Update: Yeah, farming the Hurry Up units with my Great Knight actually worked, until I ran out of Durability on my Killer Axe. XD
The Pegasus Knights couldn’t damage him with Short Spears, and the Wyvern Riders has less than 20% display Hit with Short Spears, too.