I only got to see the finale today & was just reading the last 5 pages of this thread waiting for someone to state & suggest this. Surely Hannah breaks out the argument that it was her who convinced Ken, after Chris (who likely had no idea) suggested it was Adam. I would have even used the lawyer angle if I was her: "You're reaching a conclusion with no proof... No wonder you've never been on a jury before". LOL. It's hard to think she would have remained silent on this (considering she couldn't shutup before it), so I reckon it's at least a 50-50 chance that it was edited out.
The other thing unmentioned thus far is how Adam cleverly left the fact about his mum until as late as possible in the Tribal Council. He even foreshadowed it in answering the 1st question, saying something like "more will be said later". While it would still have had a strong effect if he mentioned it early in TC, Ken & Hannah may have adjusted their methods a little. But saying it late gave them no chance.
Hannah making that rebuttal would have minimal impact, with Ken sitting next to her saying that he made his own decision.