[Avodah] rav vs talmid chacham

[saul newman via Avodah]

in re gemara Baba Batra 21a , could someone explain what the relationship
between the title 'rav' and 'tzurba merabanan' is?  it seems one could have
the former title and yet be felt to be relatively ignorant.  yet the rav in
question was of a sufficient madreiga to cause the death of another rav
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