system
Given the following post, respond as if you're commenting on Reddit:
human
[Men in Black 3, spoilers] How is J in MIB?

K recruited J into MIB.. In the alternate timeline where K is dead, how is J in MIB? Who recruited him?

In the alternate timeline, J's father was probably alive, or at the very least K would have died before he met J, so no one at MIB would have known about him. Even if his father was dead in both timelines, he would have just been some kid.
gpt
Given how he was discovered, in that he chased down a fugitive alien on foot and how that doing so with that species was conventionally seen as 'impossible', and there was already an agent in pursuit of the fugitive, whatever other agent had been sent would have taken the place of Kay and recruited Jay.