I have nothing solid to link the 1792 Adly to the 1764 Adly, as the 1764 Adly died before the 1850 census, and nothing in the descendancy of the 1792 Adly shows a resemblance to my Alexanders. My only beliefs, which are fairly tenuous, are these:
1. That the 1792 Adly was of the right age to be a son of 1764 Adly
2. That my Adley Adams, son of Thomas Adams and Louisa (Alexander?), also of Carroll Co., bears the same first name - Adly.
Neither of these constitutes proof, but I hope they answer your query about what makes me think there might be a relationship between the Adly Alexanders.