The swaras ‘sa’ and ‘ri’ alone however much they are emphasized, will not be palatable to the ears, until all the seven svaras show up.
Barring the silent samAdhi that takes place after the mind fully rests, the various dispositions of even little little activities of the mind will not show up unless they take new and newer forms.
‘Not showing up’ does not mean they are not visible to outsiders; even to the individual himself they will not be felt in his consciousness.
Bhakti in the NirguNa implies an anguish of the individual soul to dissolve in the Universal Soul. That one-pointed anguish is like extending a single svara.
There is no scope for new and newer colours in it.