According to his teacher, master Tio Tek Kwie, what Lin learnt from the supposed "Hek Ki Boen" school was NOT Winf Chun, but a martial art known as Cap Pwi Lohan Jiu (She Ba Lohan So), or 18 Hands of Lohan, a mix of a few Hakka Kung Fu styles. That's the reason for the resemblance with 5 ancestors, white crane etc.