Bāhusaccamahattaṃ

Dear Group,

I recently came across a Sutta (pārājikapāḷi, verañjakaṇḍaṃ, par. 21) where the Buddha enumerates the 4 reasons that will cause the Sangha to be defiled : (1) rattaññumahattaṃ, (2) vepullamahattaṃ, (3) lābhaggamahattaṃ, (4) bāhusaccamahattaṃ.

I looked up the commentary for the last term and it says:

bāhusaccamahattanti bāhusaccassa mahantabhāvaṃ. saṅgho hi yāva na bāhusaccamahattaṃ patto hoti, tāva na āsavaṭṭhānīyā dhammā uppajjanti. bāhusaccamahattaṃ patte pana yasmā ekampi nikāyaṃ, dvepi ... pe ... pañcapi nikāye uggahetvā ayoniso ummujjamānā puggalā rasena rasaṃ saṃsanditvā uddhammaṃ ubbinayaṃ satthusāsanaṃ dīpenti. atha satthā “yo pana bhikkhu evaṃ vadeyya — tathāhaṃ bhagavatā dhammaṃ desitaṃ ājānāmi ... pe ... samaṇuddesopi ce evaṃ vadeyyā”tiādinā (pāci. 418) nayena sikkhāpadaṃ paññapetīti.

which I attempted to translate as:
As long as the Sangha has not reached great learning, dhammas caused by (ṭhānīya) defilements do not arise. However, when great learning will be reached, because they have learned 1, 2,..5 nikayas, some people who understand in the wrong way (ayoniso ummujjamānā is explained by the ṭīkā as viparītato jānamānā) will explain the Teachings of the Buddha in a way which is not in accordance with the Dhamma (uddhamma) and the Vinaya (ubbinaya).

I have left aside rasena rasaṃ saṃsanditvā because I can’t make sense of it and the ṭīkā doesn’t really help much: Rasena rasaṃ saṃsanditvāti sabhāvena sabhāvaṃ saṃsanditvā, anuññātapaccattharaṇādīsu sukhasamphassasāmaññato upādinnaphassarasepi anavajjasaññitāya anupādinnaphassarasena upādinnaphassarasaṃ saṃsanditvā, samānabhāvaṃ upanetvāti attho.

Could it mean that those people (and why puggalā here and not bhikkhu since we are talking about the saṅgha ?) mix truth (sabhāva) with truth  in such a way that it leads to confusion ? I don’t know either how to translate the second part of the ṭīkā.

Thank you,

Florent