Leach, the innovator of the "air-raid offense" died at 61 on Monday after complications related to a heart condition.
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McNeill sat down with ABC11 Sports Anchor Travon Miles to reflect on the life of his friend and former colleague.
"Mike was an innovator. He was, I would call him brilliant and genius," McNeill said. "And also had an innocence about him ... he was very inquisitive."
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McNeill said Leach had his beliefs and didn't waver from them -- in football and in life. He was a great family man, McNeill said, and he made his assistants plan time with their families.
Watch the full interview in the media player above.