A historical/mythological character that would fit perfectly in a Singularity/Lostbelt but somehow wasn't in there

Does anybody ever felt like there were these moments in FGO where a perfect opportunity for certain historic figures to feature in a Singularity/Lostbelt/Main Story Event but ended up not appearing at all despite how well they could fit in?

I'll give my own two exemples, being the motives behind I decided to make this post. Both are related to Sixth Singularity Camelot and I'm talking about the two legendary rulers: Saladin and Baldwin IV

These two character's lore are deeply connected within the Crusades and the Holy Land, premises that were also present and mentioned in Camelot as one of the Singularity's themes. And like, having read the background of these two, it makes me so dissapointed in seeing they weren't featured or even mentioned in Camelot.

Saladin was the very first sultan of Egypt and Syria, being seen as a great leader and even a man of principles and high regard by his christian enemies. A fervent follower of Islam who spent a good portion of his life in trying to conquer Jerusalem during one of the Crusades, being one of the greatest and biggest figures of the religion and all of the Middle East for doing so. (Also, small fact, it's canon to the Nasuverse that this man fought against a Dead Apostle with the help of motherfreacking Richard I Lionheart and the leader of the Hassans at the time! How can this badass of a man not be in the game yet?!)

As for Baldwin IV, he was a tragic king of the remarkable nation of Kingdom of Jerusalem, the central focus of the crusades. He had the nickname of the 'Leper King' due to suffering of a leprosy disease, not being able to live and rule the kingdom for a long time, dying only at the age of 24/25. (There isn't any evidences that he used to hide the terrible state of his skin face with a silver mask, but it does make him have a very dope design!) Many doctors tried to treat his illness but to no avail, dooming Baldwin to the short life he would have as king of Jerusalem. Despite that, he'd still appear in the battlefield to fight even with his decaying body, his will and determination being worthy of admiration by his soldiers. He was also a great rival to Saladin in the Crusades, with the two having great respect for each other. Baldwin was also perceived as a sanctly figure for having protected Jerusalem despite of his illness, having made the kingdom prevail and prosper during his short reign, tought to be the sole reason why Jerusalem still standed.

When looking at such characters like these two and then looking back at Camelot, I can't really help myself but feel 'Wow! It would have been kinda cool and fitting to have them in a Singularity that happens during the time of a crusade and is located on the Holy Land itself!' I mean, you can't tell me that their presence in Camelot wouldn't feel anything else but natural. But unfortunately, such chance was missed. And I'm not even going to talk about the Sixth Singularity of FGO Arcade. Still, Camelot is pretty great and clear from any other Singularity minus Babylonia.

Hmm, so yeah. Any other examples of historical characters that could have fit perfectly in a Singularity/Lostbelt?