Red Cherry Shrimp - Sexing & Care Advice?

OK so I'm now very confused!

I noticed recently that my 'male' RCS (very pale compared to the others) has developed a whiteish coloured 'saddle'... after looking this up this seems that actually he is a she and the saddle would be eggs. So now I'm a little suspicious that I actually only have 3 (or 4 if the missing shrimp is just hiding out) female shrimps since the other shrimps are much larger and a deep red colour compared to this little guy.

Also if my 'male' shrimp is actually a girl with a saddle and my other shrimps are all female how does that work? Are they simply eggs waiting to be fertilised that will disappear with no male?

Stupid questions I know I just don't really know the ins and outs of shrimps!

My tank is quite full and I thought had enough hiding places, but if my fourth shrimp has disappeared perhaps I need something else for my shrimp to hide in like a cave... I just need to find space for it! Perhaps it's time to kick out one of my last remaining fake plants.

I also noticed earlier (and yes I know you guys are going to moan for me bringing the topic back to poo!) that my biggest cherry red shrimp had a long strand of poo the length of her hanging off her. It's still there too. Is that normal!?

Hmm so it definitely sounds like my 'male is actually female - I'm very tempted to go and buy some... well actual males to fertilise her eggs! Though I would really like to get to the bottom of my disappearing shrimp before I get any more =/

Earlier I saw my newest endler Ace hassling a shrimp to steal her shrimp food, but she didn't seem too bothered about the ordeal. I then also saw the biggest shrimp and one of my other bright red shrimps 'fighting' over sitting on a leaf which I've never seen them do before.

I gave them peas not too long ago so that might explain the long poo. I might have to try giving them some courgette at some point too to see if I can do a headcount as I've heard they normally 'swarm' over food like that. Generally if I'm feeding my fish the shrimps don't seem too interested unless a bit of food drops in front of them.

I'm waiting for some repair guys to arrive to fix my washing machine but once they've gone I can do a waterchange and investigate. I'm now concerned my shrimp might have been caught in the tube if they'd somehow snuck between the pre-filter sponge and the filter intake...  I see snails in there so I guess it's not impossible (though they're obviously much smaller!)