#4- He wrestled quite a bit early on
From 1967 to 1974, Bobby Heenan was a regular worker for Indianapolis-based WWA as a wrestler and a manager. He was managed by Randy Savage's father Angelo Poffo and Chris Markoff.
Therefore back in the day, it was Heenan who needed a manager. He would later be paired with other wrestlers for the same reason. Only he was the manager with the magic tongue.
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In later years Heenan didn't wrestle much but it did happen from time to time. He also took some bumps in the ring, when a babyface would win the chance to get some time alone with Heenan in the ring.
Sometimes the stipulation would even involve putting The Brain in a Weasel suit. When Bobby Heenan went to WWE, he brought The Weasel suit with him because it was actually his.