>>977505
>astra+lighter might make S11 hit harder but I'm sure that Orphie's damage will offset that
Astra is a massive stack stick.
>1200 ATK + 25% CRIT DMG + 20% DMG + Support ball (20% DMG for her sig or ~12% in-combat ATK for Kaboom) + the ability to carry Lullaby AND effortlessly keep Astral stacked is just too damn much.
Lighter's
>75% DMG + 15% RES Shred + 30% CRIT DMG (his W-Engine) + either another 30% CRIT DMG or 18% DMG from Lullaby (on Astra)
slide on top of Astra's buffs providing a massive but pretty well spread-out set of multiplicative buffs.
S11's BAs are very saturated on DMG%, but the rest of her kit isn't - she only has up to 32.5% from her AA and the likely 10% from Inferno Metal.
Running Orphie with S11, you could do something like Astral on Orphie + Summit on Trigger, so that's
>700 ATK + 24% from Astral + personal damage (quite a lot of it with her W-Engine)
on Orphie
>Permanent 35% Stun DMG Multiplier + 25% DEF Shred (with W-Engine) + 30% CRIT DMG
on Trigger
As you can see, you'd need Orphie's personal damage to put in
a lot of work to overcome the stats you'll get from Lighter/Astra.
If the DEF Shred from Orphie's AA applies to at least some attacks of S11 (say, BAs), then it might work like a rather strong damage multiplier with the rest of the stats coming mostly from S11 herself (DMG% from AA and Core, ATK% from The Brimstone, CRIT from Inferno Metal).
So there's a hope for a better-distributed set of multiplicative stats, even if the total number ends up being lower, so between Orphie's personal damage and S11 getting better field-time (albeit sustaining Astral will still require you to swap around) it might just compete.
But with Orphie's buffs not having full uptime and/or S11 receiving absolutely zero benefit from Orphie's AA, I don't really see this squad being particularly strong. It'll work, sure, and it'll probably be fun, but it won't be actually competitive.
Another obvious consideration is S11/Lighter/Orphie and S11/Orphie/Astra and both are likely to be better than S11/Trigger/Orphie (unless the Aftershock dream lives), but I feel that both of those are downgrade from S11/Lighter/Astra.
The 85% DMG increase across 90% of her kit on Orphie seems to exist specifically to make pairing Lighter with her mediocre.