Board Thread:False Info and Speculative Discussion/@comment-25222572-20150608135325/@comment-4280498-20150608200851

Stiles, again, remembers something that Scott, who barely pays attention, doesn't.

Theo is apparently someone from Scott's past and Stiles remembers him being mean as compared to Scott. That would make sense, but it could also stem from Stiles being jealous that an old friend of Scott's is a werewolf and Stiles isn't.

Just a guess