This Grand Indra situation makes me value Orion a lot more. I actually never had an issue with him as Grand Archer. It felt thematically right to pick one of the greatest hunters of Greece for it and he'd definitely be one of my top picks if I wasn't introduced to the bear form first (my top picks outside Greece would have been a Robin Hood or Hou Yi).
And then looking back it worked. Orion was in a suppressed Normal Servant level but he was going around onepunching monsters that others struggled with, it was vague enough to be either because of his strength or bonuses against beasts but either way it nailed the point of his niche. He also put a lot of emphasis on his instincts and skill, refusing the nanomachine powerups for reasons he didn't properly understand and his capacity to aim shots all the way to the stars as well. The story didn't make much of a big deal of those traits, but it succinctly exposed his feats and justified why he'd be a Grand Archer.
He got a lot done right. Most of the other people I'd imagine as the Grand Archer would have similar archery abilities or exploits. Not like splitting a country in two as Arash did, but capacity to aim an arrow across a country as Arash did.