People often forget to mention that this game is not as hard as some make it seem. You don't need -50% defense and attack down. That is just for the over achievers and min/maxers. Simply having a decent amount is good enough to make it through game.

Sol and Raphael are good enough to start a decent light team. Aling with those 2, using Mordred with Ambush ex skill, you have -45% attack, -30% def and still get Black Propaganda. -50% attack if you got Yatagarasu from the current event and -40% defense if you get Vine from main scenario shop. You have 2 free slots for whomever. I don't remember anything about R light kamihimes since I havent needed to use any in a while.

Your fire team only has 2 attackers that provide team support so they'll be more difficult to use. You can make do using Mordred wih Sniper Shot and the 2 gem gacha R kamihimes with -10% attack and the other with -10% defense, Nergal and Baphomet or something. The problem here now is you have absolutely no heals and no free slots for a healer. Even if you get a healer like Brynhildr, you'll have to give up a debuff or a SSR. You can use Cassiopeia/Andromeda but lose Black Propaganda since you need the stat debuff from Sniper. This can easily change if you get Amaterasu or the R fire kahime Sakuya.