Agreed on the Zappa bassists, Fowler being my favorite overall. The short comeback of Roy Estrada was indeed unexpected, but maybe that had to do with the need of travelling to Japan and Australia with a small line-up possibly to reduce costs. Since this would definitely reduce the possibility of playing Zappa's most complex tunes that relied on expanded instrumentation, in order to play more simple tunes Zappa wound rather take someone who was fun to travel with: El Orejón.
Lots of assumptions here, but who cares anyway. I'm probably wrong.
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