What is the subject of «نَجَحَ» in «جَاءَ الَّذِي نَجَحَ»?

Relative Nouns — Ṣilah, ʿĀʾid, Forms and Syntax

• The alif of «الَّذِي»
• An implicit «هُوَ» serving as ʿāʾid
• A tāʾ on «جَاءَ»
• There is no subject