I'm not at all familiar with Sheehan but I get the idea that, as a forefront bass player, he's kind've an outsider. He doesn't receive the same journalistic attention as other players given similar roles in music. However--I have no idea what his music is like, I've only heard a couple of tracks. I liked them a lot but he was not doing anything flashy.
Just my 2 cents on Sheehan.
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As full and bright as I am, this light is not my own.
--the Moon