Raanta is a much better hockey player. Elite goaltender. .921 career SV%.
Cogliano isn’t better than Crosby because he’s missed less games.
Kuemper has a .918 career SV% and a .925 over the last 3 seasons. I don't believe he's actually better, but any difference is far more marginal than your comparison. Goalies are also different than skaters, as reliability tends to be more important.
I guess Kuemper is better than I thought, but it doesn’t change my point that Raanta is an elite NHL goalie.
Goalie reliability is only important in the playoffs. Teams in today’s NHL have two guys that can play 40 games.