@jhull (Funny you should mention Strategy and Analysis, since that's the MC's Issue...it's almost like you understand this stuff! )
The story is a Regency-era romance, and the OS Throughline is about the characters trying to clear the name of the rightful heir to a baronial estate who is a fugitive because of a past murder charge. The MC initially believes that the heir is guilty, but then at the 2nd MC Signpost, he Learns that the heir was framed. The MC certainly is involved in a great deal of Strategy and plans from the other OS characters swirl around him, but these plans are based on what the character would like to happen rather than on what it true. Ultimately, the MC's correct Analysis of the situation and antagonist allows him to devise the strategy that succeeds in resolving the OS conflict. (I know I'm talking in structural rather than narrative terms. I didn't want to make people read a long plot synopsis).
Everyone in the play initially devalues the MC because he does not seem to fit their idea of the proper romantic hero. But he proves to be the linchpin to success at the end. I was wondering if his inherent personal qualities of being a suitable trustee of the estate, his keen analytical mind, and his shooting and pugilistic skills (all of which he possesses from the start and don't change during the story) qualify as Prerequisites as his Unique Ability?