But it looks to me superfluous.  I don't think both are very good.
If anything, isn't it better to get used to the commands beginning
with S? ;-)

[1]
Gnus provides the `gnus-article-read-summary-keys' function for
the summary commands in which each of command is assigned to two
or more keys.  For instance, the `S' key in the article buffer is
bound to it.  If a user types `S o m' in the article buffer, Gnus
moves to the summary buffer that is associated with the article
buffer at the time when the `S' key is pressed.  And then it
reads remaining keys, looks up the summary command which is bound
to that key sequence, and invokes the command.  The reason this
way cannot be used for the `C-c C-f' keys is that the `C-c' key
is a prefix command, which is used with some commands that are
not the summary commands, so it cannot be bound to `g-a-r-s-k'.