In that case it would invariably come down to the strongest Servant/Master Pair if they all complimented each other. Which would not be the kind of conflict we as the audience or we as Angra Mainyu want. We as the audience want an interesting story and Angra Mainyu really wants all them bitches to suffer.
Lies and slander. Moedred is best saber!
Statement: "Counterpoint, the whole point of what the war is supposed to be is explicitly not having the bigger sword lasers as opposed to being able to best engineer a situation where your killing ability and defensive/evasive ability is maximized while minimizing you opponents killing ability and defensive/evasive ability.
Otherwise the only valid classes would be archer saber and saver as opposed to all other them. An example would be Dr Jekyll and mr Hyde who rather than having a territory act as a force modifier and adaptive force for themselves, their masters, and their berserk state. This means that Dr Jekyll and me Hyde are just as effective on well scouted neutral or even hostile ground as opposed to only their own territory because they themselves alongside their master act as what is in effect their territory. This also means that they can be nigh unstoppable for one enemy while ano5er could stomp them easy as they would adapt themselves to their enemy.
Another example of this is literally every assassin except Hassan. They are all weak as fuck but work by turning the circumstances into ones that allow them to project a killing power far beyond what their stats would project.
Basically, it should never boil down to the most powerful servant. It should boil down to which pair is best able to leverage their abilities for maximum killing power.
Some douche with a rule 63 spell and Jack the Ripper should utterly pwn Karna, Gilgamesh, EMIYA, EMIYA, SHIKI, SHIKI, Shiki, Shiki, Shiki, Shiki, Shiki and all those other hax as fuck servants due to having an excellent ability synergy that allows them to make almost any battlefield such that the only way to eliminate them is a one shot ambush. However, said pair should in turn be pwned by any gender less servants like GOETIA, and Enkidu as well as servants who nullify OHK abilities like Heracles and Achilles as well as being easy to one hit ambush as Jack the Ripper has no defensive or sensory abilities beyond the "norm" meaning that even a relatively low prescience concealment or even a mortal magus skilled in stealth could kill them easy as they would be the definition of glass canon on an open hill once you know where hey are
TLDR: The whole point of the classes is that any servant can win regardless of power and if you boil it down to strongest sword laser you are ruining the entire premise and handing everyone the idiot ball. The reason that happened at any point in canon was almost always because of shirou who already has the idiot ball so hard even he thinks he's stupid as fuck."
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