The second correction is not needed.
When you use a comparative or superlative, you have a few options:
(1) X is more talented (than Y).
(1) is a direct comparison between two entities.
(2) X is the most talented (in the group).
(2) picks out one person as more talented than everyone else in the group.
Then we have the structure that was on your assignment:
(3a) X is the more talented (of the two).
(3b) X is the most talented (of the three / of all).
(3) is very much like (2). It picks out one person as more talented than everyone else in the group. Here, "of the three" means something like "when considering the three (people)".
But when the group consists of exactly two people, you change "the most" into "the more".
This is what you see in your sentence.