I completely advocate this idea.
Why? What is the basis of this opinion? Complete your thesis statement by indicating your major discussion points for further development in the succeeding paragraphs. The indication of your supporting ideas lends to the higher TA score as it will help determine the clarity of your opinion based on your understanding of the topic.
It is undeniable
Some people will deny this. Do not make claims that can be countered by a separate argument. In fact, you do not need to claim the validity of any discussion in the presentation since nobody is asking for that. The topic for discussion does not require this statement and should not be included in the discussion. It is better not to make exaggerated claims that could affect the original discussion presentation's accuracy.
You could have done more with the concluding summary. Make sure to always summarize the full discussion based on topic, reasons, and repeat of your opinion, within 40 words or 2 sentences to help increase the accuracy of your English comprehension skills and your ability to restate a discussion based on short presentation formats. Your TA score will be thankful for it.