The 'akaza sad story' might refer to the tragic backstory of Akaza from Demon Slayer. Akaza was once a human with a strong will. He had a family and a normal life, but due to various misfortunes and being turned into a demon against his will, he lost his humanity and was forced to do cruel things. He also had a lot of inner struggles as he still retained some of his human emotions deep down, which made his story a sad one.
It's not easy to say who has the upper hand. Archer has the advantage of experience and a more complete set of skills. But Shirou has his own tenacity and the ability to surprise. In different situations during the battle, either of them could seem to be in control for a while.
Well, it varies. In some stories, the Daleks' sheer power and ruthlessness give them the edge. But in others, human ingenuity, courage, and unexpected alliances can tip the scales in their favor.
One idea could be a rengoku fanfic where he trains a new group of young slayers. It could focus on his unique teaching methods and how he instills his values in them.