We certainly can all have our own opinions on where he would rank, and i would put slick Bill and Obama above him, but i also think younger Trump was in that top tier.
The way i am looking at it though is broad big tiers. The top one being orators who are very adept and capable speakers. The next tier would be speakers who are have serviceable, good speaker abilities. And the bottom tier would be poor orators.
None of that is based on content. Meaning it is not about agreeing with what they say.
I invite you to fast forward thru the above and just focus on the Trump speaking and tell me you do not think a very capable and adept speaker, which is what makes the contrast to todays bumbling, slurring, forgetful Trump so stark and shows his cognitive decline to be so much worse than Bidens.