If you plan on using the Pioneer with a Maestro then, yes, you can have two USB's active. One through the radio and one through the U-connect. U-connect doesn't improve with another radio - it still has all it's quirks and one new one. If you have a USB in the console, the radio will play where ever you left it for a minute or two and then switch to the console USB because it takes U-connect so long to boot up.
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