I agree with you. Chelsea have serious problems in their defense. I am confused why Chelsea increase the number of goalkeepers even though currently there seems to be around 8 goalkeepers in the Chelsea squad. But it seems true what X-ray said, Chelsea increase the number of goalkeepers not only to find the best and strengthen their defense, but to do some business and get profit from the player's price.
That many goalkeepers will definitely be very wasteful for a team because Chelsea will only use a few and it would be more ideal if Chelsea could sell half of that number to other teams and buy some other defenders to fill their defense to make it better. Because a team must be better from all lines and more importantly is the defense side apart from the front side which must also have fast finishers so that there are goals from each match. But I don't understand what Chelsea is doing now so that they can have that many goalkeepers.