Blacklisting snd_bcm2835 while mixer control still missing, playback works. Sound quality is much better than built-in audio which is not a big supprise.
Also, it shows that the 'modprobe snd_bcm2835' in alsa-modules...tcz must be removed as it is overriding blacklisting
BTW it is connected to RPI's USB, no powered hub used, looks OK. Also it is not necessary to change USB settings which is good,