If you find anything wrong in the translation that I did in Part 1 and 2 where Yajnavalkya tells Janaka that he has achieved that jnAna and the reasons for it, you can highlight.
Otherwise I think the Br Up 4.4.22 and 23 explains what you need sufficiently and well.
I always wrote, going to saMnyAsa (as part of Asrama dharma) is a rule, but going to saMnyAsa from other Asramas than Vanaprastha is an exception and that's exactly what the Jabala Upanishad says. It defines the rule first and says in case of virajet go to saMnyAsa. I see that as an exception.
As far as dictionaries are concerned, this is how viraja and viraga are defined.
Vi-raja is free from dirt, clean etc. rajas is indeed passion, figuratively as the dictionary says. Passion is nothing but energy. Vi-rajas is indeed lack of passion, lack of energy. If one loses all the passion/energy, then that person can go to saMnyAsa.
Vi-raga is free from color/likes, aversion etc, VairAgyam is ascetism as it is aversion (to worldly objects and desires).
viraja (3. %{vi+raja} for %{rajas}) mf(%{A})n. free from dust , clean , pure (also fig. `" free from passion "') S3Br. MBh. &c. ; free from the menstrual excretion L. ; m. N. of a Marut-vat Hariv. ; of a son of Tvasht2r2i BhP. ; of a son of Pu1rn2iman ib. ; of a pupil of Ja1tu1karn2ya ib. ; of the world of Buddha Padma-prabha SaddhP. ; (pl.) of a class of gods under Manu Sa1varn2i BhP. ; (%{A}) f. Panicum Dactylon (= %{dUrA}) MBh. (= %{kapitthAnI} L.) ; of the wife of Nahusha (spiritual daughter of a class of Pitr2is called Su-svadhas or Sva.svadhas) Hariv. ; of a mistress of Kr2ishn2a (who was changed into a river) Pan5car. ; of a Ra1kshasi1 Cat. ; n. N. of a place of pilgrimage MBh. ; %{-prabha} m. N. of a Buddha Buddh. ; %{-loka} m. N. of a partic. world , VB. ; %{-jA7kSa} m. N. of a mountain (to the north of Meru) Ma1rkP. ; %{-jAkSetra} n. N. of a sacred district Cat. ; %{-je7zvarI} f. N. of Ra1dha1 Pan5car
virAga2 m. (for 1. see p. 952 , col. 1) change or loss of colour Naish. ; excitement , irritation Pa1n2. 6-4 , 91 ; aversion , dislike or indifference to (loc. abl. , or comp.) Ka1v. Ra1jat. BhP. ; indifference to external things or worldly objects Sa1m2khyak. ; the faulty suppression of a sound in pronunciation , RPra1t [982,2] ; a partic. high number Buddh. ; %{-vat} mfn. indifferent (%{sarvatra} , `" to everything "') Cat. ; %{-viSabhRt} mfn. cherishing the poison of dislike or aversion MW.
vairAgyan. change or loss of colour , growing pale Sus3r. Ka1m. ; disgust , aversion , distaste for or loathing of (loc. abl. , or comp.) Bhag. Ragh. &c. ; freedom from all worldly desires , indifference to worldly objects and to life , asceticism Up. MBh. &c
The problem I see trying to connect Vi-raja with VairAgyam which is derived from Vi-raga.
Another problem I see is, the person going to kAsi yAtra is not having lack of passion. He is not leaving passion. So that's not what it is.
Another problem I see is the Atma jnAnam is not going to saMnyAsa at all. Br. Up. 4.4.22 and 4.4.23 explains what it is.
-TBT
