While John Ruddy could be back from thigh surgery in time for the final dozen matches of the season, Gunn feels Hughton's recruitment of back-up Bunn was an ideal move.
"We have all been number twos in our career and it's one of the most frustrating positions," said Gunn, speaking on the Premier League Podcast.
"Even outfield players get more opportunities of playing, but when you are a number two goalkeeper you don't tend to get much first-team action apart from League Cup games or things like that these days.
"The injury to John Ruddy came as a great shock because he had been playing really well and got himself into the England squad. So to have someone come in and slot into the team, and not look out of sorts, is great credit to the scouting they have been doing behind the scenes to bring these players in at the beginning of the season.
"Mark has got an opportunity now to make the position his own. John will be back in a couple of months but certainly if Mark continues to play well, that gives Chris Hughton a nice headache when it comes round to choosing between the two goalkeepers."