Merlin isn't a Grand, he's a candidate, like Gilgamesh's Caster form. the only confirmed Grand Caster (of which there is only one per class) was Solomon.
That's probably why he's holding up the Solomon cutout. Merlin's not wearing a party hat.
Merlin isn't a Grand, he's a candidate, like Gilgamesh's Caster form. the only confirmed Grand Caster (of which there is only one per class) was Solomon.
But the fgo material says that Merlin became the grand caster after Solomon's sacrifice...