Yeah, all Commandos will make the corporal rank (2.5-year NS) at the least, mono-intake notwithstanding.
1 question, does mono intake BMT at dippe barrack, home of the 1st Guards mean u will be a guardsman after POP?
Only after a subsequent Guards Conversion Course, to earn the tab. Mono-intakers also do vocational-training, but generally not at the relevant Formation School like the Tekong "grads."
I dunno what's the current system, but for the old - Arty - format it was that the inarriving BC, BSM (both regulars) & Arty NCOs (10th-month NSFs) who conducted/trained together with the men during this period. The NSF officers & non-specialists would only be posted in about 3 months later, so that on paper everyone can technically ORD together 18 months on & enter the reservist ranks as a unit.