What I do not understand is why are there kusala citta without the panna-link mentioned, e.g. rupavacara kusala citta or arupavacara kusala citta?
“…Tattha katame kusalamūlā? Alobho, adoso, amoho—ime vuccanti “kusalamūlā”. …”
Only some of the maha kusala citta and the lokuttara kusala citta have the panna-link.
Maybe the akusala mula PS operates when the level of understanding is too low, thus avijja is present. In kusala mula PS “amoha” could mean a better level of understanding.