Can an underground rapper be considered for GOAT status?

Why or why not?

If they can't, which rappers of the past 10 years would you consider potential GOATS, or put on an all time top 10 list?
Update: Hey everyone! Missed you guys too - good to see some of you are still around, I thought everyone had left.

Cap, don't make me get Robert Burns up in this ***** Mr Thon.
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