So, who will win the Taylorbowl? Olga and Jalter are in the running, but a third is all but inevitable. My bet is on Moedred.
No, she couldn't. That was half the conflict of Fate route. Artoria couldn't do anything against Herk except get ragdolled. The only solution she had was Excalibur, which is expensive and extremely destructive, making it exceptionally unwieldy in most of the story's combat scenarios. She even has a line when she and Medusa have their final battle about how fighting on top of the skyscraper might be advantageous to Rider, but it's also advantageous to her, because she doesn't have to worry about collateral damage when she can aim up at the sky. There's a line later where she talks about the corpse of the tanker sitting in the bay, and how Kiritsugu put it there so she could use it as a backstop in the previous war, just for the sake of avoiding doing too much damage to the city.
There are so many A-Rank NPs thrown around these days that it's really easy to forget, but Herk was a fucking monster in the OG FSN. That was why it was such a big deal that Saber Alter could toss him around without much trouble. Herk being so strong is the main reason Rin partners up with Shirou in Fate route, in fact, because she realized exactly how outmatched they would be alone.
Wrong. Artoria COULD actually actually instakill Herc with a full powered Exaliblast. The real problem is Shirou is an
extremely shit master and provided her with very little mana, just enough for her to not hemorrhage mana, due to him not even having his own magic circuits activated, and a half-assed emergency summoning. Saber, at that point, had used most of her mana Excaliblasting Rider using her banked mana, hence the lewding, or the magic dragon in Realta Nua. Shirou traces Caliburn, while Rin takes out some of his lives as well. Basically, Saber was gimped as hell in most of the 5th war. She's only de-gimped as Alter with Sakura as a master, or Rin.
Rin, Ritsuka's and, to a lesser extent Kiritsugu on the other hand are good masters, and provides all she needs. Ritsuka has the same as parameters as Rin's.
The game even shows stat blocks at every point, on a per master basis. Her NP is crap without a decent mana supply, hell, she's an entirely different Servant under Shirou. Keep in mind even with the stat nerfs, it's actually
worse, because she had little to no mana to throw about, hence most of even her basic toolkit, like mana bursts, had to be used scantly.
Under Shirou:
STR: B
END: C
AGI: C
MAN: B
LCK: B
NP: C
Under Rin:
STR: A
END: B
AGI: B
MAN: A
LCK: A+
NP: A++
Under Kirisugu:
STR: B
END: A
AGI: A
MAN: A
LCK: D
NP: A++
About the twins, they're
unique in canon. They can hold like a gorillion Servants and are apex masters, but absolute dogshit at magecraft, because they only have a
single, albeit high quality magic circuit. Almost all of their magecraft is dependent on mystic codes, even Gandr. Remember, they aren't even a member of the B-team originally, she/he was the worst of the worst.
Most people can contract only a single Servant, several if particularly good. Ritsuka, meanwhile can contract
hundreds. They can also summon shadow servants, though someone who plays FGO would need to check the details of how.