I have been think about this questions.
-Why didnt Waver particupate in 5 holy grail war he could invock Iskandar and win( i really think nobody can top iskandar np in the 5 holy grail except saber ,cu , medusa with sakura master, heracles) .
- If gilgamesh died during singularaty how he didnt remenber about fujimaru mash, ( i know that after the end of a singularaty everyone forget abouut it), he doesnt how he died? I havent know where he put the grail!