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.
Bringing in more goalkeepers will not sealed the prospect of formidable form for the club. I'm pretty amazed with the current signings of the Blues, atleast it put them out to become a competent contender for the English Premier League title next season, definitely a competitive one. Chelsea making random signings and not of all of them are consider important, we have other streams that have become very active towards the signings from Todd Boehly actions.