Can we get an F for Brave Hector?

No because W!Ephraim may not be able to benefit from Ward buffs consistently.

Also, his weapon goes against the perks of being armor: being close to each other and getting Ward Armor Buffs.

Hahahaha
Yeah... No.

Ephraim=walking stat machine, no DC or a build in QR, can't be next to allies.
Hector=dc master (has +4atk/def when defending), dual phase with QR effect and bolt fighter, is in the permanent pool.

Ephraim is certainly going to be strong, but he ain't the bait champ Brave Hector is

How did Ephraim powercreep a prf Slaying Lance with built in QR5 and Ostian Counter?

The only similarity is that they are both lance armors. Otherwise they're not remotely the same.