Brayshaw said his brother Hamish Brayshaw, who has developed a close friendship with Gaff after being drafted by West Coast last year, helped convince him Gaff's blow was out of character.
"The action itself is horrific," an emotional Brayshaw told Channel Seven.
"But the person that Andrew Gaff is, I forgive him and I'm not going to hold a grudge against him as a person.
"Hamish told me that out of all the people he knows, and all the people in the AFL, Andrew Gaff would be the last person to do it.
"(A) good bloke has made a bad mistake."