In addition, I suspect that Grant's profile has only increased significantly over the past 10-15 years, with some publicity resulting from his contributions to numerous BN sessions and 'acid jazz', including work used on remixes etc ('Windjammer' for one). Wes's profile peaked back in the late 1960s as a result of the Verve/A&M Creed Taylor-produced work and has stayed consistently high thereafter.
I suspect that another factor too is that previously obscure but excellent BN releases by Grant are only just starting to be really appreciated by the listening community at large, as a result of the CD reissue programme. One case in point would be 'Idle Moments', which seemed to be something of an obscurity until the first BN CD issue.