im doing alexander prime fight on difficult i dont have any of his yet 8 runs no drops other than materials and tales just seems odd to me
Odin/Alex/Cait are the start of the new HTBs where drops arent guaranteed based on difficulty(least on N/D/VD), so expect it to take a big to get drops, though on D it shouldnt be too bad getting something, probably just poor luck.
Lilith is even worse(though better now with box drop i guess) and shinryu even worse than that when it comes to weapons/armor.