Zenk never had the interview skills to be a main eventer. He had the look, but was insanely generic.
I think Tom Zenk showed more charisma after he left the business (through his blog site) than he ever did on the mic as an active wrestler. There was 'something there' to work from, but for whatever reason he never made it to the next level.
While most people only remember the Can-Ams from their WWF run, the team actually spanned several years and worked multiple promotions. For what it's worth, Tom Zenk did a 'shoot interview' (linked below) that gave his side of the story regarding the break-up with Martel: