7.) Jason Varitek
At the bottom of the list here is Jason Varitek who was only recently granted permission by the Red Sox to interview with the Giants. Varitek's resume as a player is excellent and he is widely regarded around the league. However, he hasn't been a true big league coach for very long and when you combine that lack of top level experience with more of an old school approach that doesn't seem like a great fit for the Giants, he seems like a longshot bid at the moment.
6.) Donnie Ecker
Ecker has certainly helped his candidacy for any future managerial openings with his work at the Texas Rangers' hitting coach this season. It also certainly doesn't hurt his case that he is familiar with the organization as he was formerly the Giants' hitting coach and the offense seemingly suffered after he left. Bringing in Ecker certainly has its merits and would probably help the offense perform, but the Giants seem like they want to go in a new direction and bringing in Kapler's old hitting coach doesn't seem to fit with that plan very well.
5.) Mark Hallberg
The Giants seem to have several internal candidates they are considering with third base coach Mark Hallberg being among them. Hallberg may be a decent compromise option as he is already familiar to the organization and its players who is regarded highly, but who also has been around long enough to not be considered a Kapler acolyte. His lack of managerial experience outside of the low minors is problematic, though, and the Giants seem to have better internal options available even if Hallberg ends up a good manager someday.