One of the menagerie (Pebbles, the Scaley Breasted Lorikeet) had his tail feathers plucked out by a bully Rainbow in December..........they havent grown back

......anyone got any clues?.....will they grow back?.......I have no idea of Lorikeet moulting patterns....................
I know, I know, Pebbles isnt a finch, but he's good mates with the WE Masks & I & has been helping out with the new aviary build, so we told him we'd ask around here.......