5kg = panca kÄma-guį¹Ä = 5 sensuality strings While first jhana is not explicitly specified this sutta, it's consonant with the same theme. That VRJ (vism. redefinition of jhana) which emphasizes samatha kung fu of 5 body senses being shut down, an impressive feat in its own right, has nothing to do with the superpower of first jhana, which is to deeply understand that the pleasure of being free of lust and desire for 5kg, is far superior. example of expert meditator teacher who could to VRJ with 5 senses shut down. Turns out he was cheating on his wife, had something like 10 mistresses over many years, some of them were paid sex workers, and likely money was coming from Dhamma teaching donations from his students. He is just one recent example among many throughout the history of meditators who could do VRJ. He could do VRJ jhanas and arupa samadhi, but he couldn't do a proper EBT first jhana where 'secluded from sensual pleasure' doesn't mean the 5 senses...
always question authority