I assume this to mean, as opposed to a "negative elder" i.e. Ras Marcus.
Interesting that you mention Ras Pidow who as far as I can tell from a poem I read written by Ras Marcus, was a lifelong bredren of Ras Marcus.
Interesting that you mention the great Burning Spear who is one of the main people who have kept the memory of the great Marcus Mosiah Garvey alive, considering that Marcus Mosiah Garvey must also be considered a "negative elder" by you, since he was very firmly against so-called race mixing. (Read "Philosophy and Opinions of Marcus Garvey" if you didn't know this).
Interesting that a young white man from a fairly privileged upstate NY background feels qualified to determine who is a "positive" and "negative" elder of Rastafari.