since Kirk Jr's legacy is so slim I thought I'd post something I saw yesterday even though it isn't much:
the track Groove Street from Art Blakey's December 1947 Blue Note session is credited to Blakey and Kirk Jr on the original release. (Later issues claim Musa Kaleem aka Orlando Wright as the composer. Wright composed the flip side, Musa's Vision, so the most likely scenario is that this credit was wrongly extended to both sides of the record at a later date...).
also, I saw in Kirk Sr's NYT obit that Kirk Jr. lived from 1929 to 1967.