duh, from the novel:
Spoiler:
The eyes of everyone widened as they noticed the mirage-like images that appeared around him. One, two, four….there were more and more images, ever increasing. The colors become clearer and more solid.
“The reason why this world can exist again... is because it is printed upon all of our hearts.”
Under their expressions of total shock, heavily armed cavalry materialized beside Alexander. Though their faces and equipments differed, their muscular bodies and mighty chargers displayed a fierceness that could only be found in a true army.
Only one person present understood what this situation meant.
“All of these beings…are servants!”
He was the only Master here, and so he understood. Servant Alexander's trump card, his true noble phantasm, was now appearing before his eyes.
“BEHOLD, MY PEERLESS ARMY!”
The King of Conquerors stood before the lines of cavalry and raised both of his arms to the skies, shouting with immeasurable pride.
Ionian Hetairoi
“Their bodies may return to ash, but their spirits still hear my call! These men are my legendary heroes – my loyal followers! They’re my true friends - breaking the rules of space and time to fight once more at my side!”
“They are my treasure within treasures; they’re my right to rule! They make up Alexander's mightiest Noble Phantasm – Ionian Hetairoi!!”
EX rank anti-army Noble Phantasm; the consecutive summon of multiple independent Servants.
all of them are servants. It is nigh impossible for modern-era humans to become servants. Waver is very much not the kinda guy to make contracts with the world to become a counter guardian, and even if he were, he's impossibly average as a magus...
so yeah, the chances of waver ever becoming a heroic spirit are next to nil, meaning the chances of that guy being waver are also next to nil...