Legate - here's a rundown on Scyld for you:
I originally created him for an RPG called
Abduction in Edoras, which was a side-RPG to the original Eorling Meadhall thread in which one of the Meadhall characters, Linduial, was abducted because of her status as Gondorian nobility. Her abductor was a man named Sorn, who was the original landholder of the Scarburg lands. Scyld was a lackey of his, you might say - sort of a jack-of-all-trades servingman, and one of Linduial's jailors.
Scyld had a tough life - his father basically sold him to Sorn because of debt, and Sorn wasn't a terribly nice person. Understandably, he had (has) some trust issues and a fairly large collection of unsavory skills, but Linduial won him over enough that Scyld ended up helping her escape. Although she promised him pardon for his role in her kidnapping, he didn't trust the Rohan authorities enough to go with her.
But when he found out that the Eorl's seat was moving from Edoras to the newly-named Scarburg, his curiosity got the best of him to find out just what these people were like that Linduial was so fond of. So he took on an assumed name (since he didn't know if Linduial may have mentioned him at some point) and has been living at Scarburg for... five months maybe? He arrived shortly after the hall moved to Scarburg.
So you can see why he'd be pretty reluctant to let his true identity be known, being a fugitive and all that.
Hope this helps.
I'm not sure what work still needs doing at the hall, but maybe Scyld and one or more of the other characters looking for interaction (Hilderinc, Quin, Crabannan) could get involved in the same task?