Soldat was that S-ranked adventurer (and Elinalise's reverse prostitute) who kept on inviting Rudeus to be a permanent mage on his team/group/squad/whatever you want to call it
@Nerex Well that was rather silly of Sylphy to do but honestly it was probably better for Rudy in the long run because he actually falls in love with her first before knowing anything then learning she was his childhood friend was a plus ( a big plus but a plus none the less).
in the LN it was stated that Rudius actually had trouble trusting women after Eris and it only got worse after Sera (an adventure girl that he had a thing for), after that he kind of kept women at arm's length it wasn't until school that he started to get better but even that was after some time. so if she introduced herself as Sylphy from the start it may have actually hurt her chances rather than help counting that he would never want to disappoint her like Eris and Sera.