It’s all in the rules, the format and the moderators. Biden will debate Trump but insist on conditions favorable to him. the MSM will cover for him and feed him prepared questions. Biden will rope-a-dope through it.
All Trump needs is a moment where Joe is exposed for what he is. Hopefully Trump’s team is smart enough to make that happen.
The trip up questions or comments will be easy given Joe's dementia. All Trump needs to do is reference a vote, comment or position Biden took 10, 20, 30 years ago and have him defend it. Biden won't recall how he voted or why. Then, as with any good debate, repetition is good, Trump does this 2 or 3 more times and now America will see that Biden is fried.