You also mentioned third choice keepers who never played a game. It was a bit of a stretch of a post. Jansson started poorly but was a decent keeper. The season we had to play Hyland more than we should have and then the season of Tomer and Horgan in 2016/17 were bad. Not sure the rest were any worse than most clubs have dealt with. Only Tomer really held us back as the rest of the team was on a different level by then. Mannus is so much better than anything bar Brian Murphy that I've seen so anyone else would look poor in comparison.
I still hope we find the stability of a long term option of course but it's tough. Pats resort to loans which has worked out fairly well so far but Id rather someone consistent in that position myself.