the raised fist has been used in unions worldwide as a symbol of solidarity and unity since there were unions.
And also, as you point out, for other things. I would say that, to you and anyone who regularly comes here, intent matters.
I admit, I find it odd that the fist is deeply offensive without consideration for context or intent. Isn't that tantamount to finding kids in sheets on Halloween deeply offensive? I think you have to consider the context and the intent.
I do think the fist could be softened to seem less threatening; it could be misconstrued as a martial arts or MMA-related. And I think from a marketing perspective, there's got to be some football ID in there - the image will stand alone often, and if it doesn't say "New York Jets Football" on first glance (I know it can't literally say that, so it has to say it visually), then it's not doing its job.
Bro!
The rights to non-news use of an actual photo of the moment would be the property of the photographer, publication, estate, etc. A drawing of a raised hand with the index finger extended in a similar manner is fine. Nobody owns the rights to that moment. Just don't take the original and manipulate it digitally to look like a drawing, that could be considered use of the photo. If you have it drawn from a *slightly* different angle, you're bulletproof. And Jets fans will know what it is.
EDIT: There are 5 different angles on the first group of results, I think you could pull it off.
https://www.google.com/search?q=joe+namath+super+bowl+finger