Adventures Dark and Deep™ explores the question, what if the designer of the world’s most popular role-playing game had not left TSR in 1985, and had been allowed to continue developing it? Unfortunately, Gary never got the opportunity to publish his next version of the game, but he did leave various hints as to his intentions over the years. Using the 1st Edition rules as a foundation, we’ve taken those hints and built an entire game around them. There are new character classes like the bard, jester, mystic, savant, and mountebank; streamlined combat; new spells and magic items; consolidated and re-worked monsters; and much more besides. All of these publicly-published bits of information about the intended revision to 1st Edition have been taken as inspiration for Adventures Dark and Deep™. And it’s all compatible with most other old-school games, so all your favorite adventures can be run using Adventures Dark and Deep™.
Not really you can run 1E type games in 2E. Adventure design changed, 2E adventures tend to be more narrative. 2E had weak adventures though hence not many make best of adventures type things.Eh .... I'm thinking Morrus wouldn't like it if he's looking for a 2e clone (as opposed to a 1e clone).
If he's looking for a clone of 2e, he definitely won't like AD&D (get it?).
Personally, I think AD&D is a truly amazing retroclone. BUT ... it's more for the type of person who thinks ...
"I really like 1e. Loved it. And I hated 2e. But my favorite part of 1e was after UA was released, and running 1e WITH UA and a lot of Dragon Magazine content."
Basically, AD&D is a total rejection of 2e.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.