If he's getting up at 5.30 unless he's superman I don't think he should get up in the night.
Op cc was utterly fantastic for us,we combined it with GF so there was very little crying after the first couple of nights.All 3 were knackered,well fed,had slept earlier in the day etc inline with the GF routine so it all clicked.
Babies are tough.Babies and toddlers will find nursery an awful lot more stressful than a few nights of cc in their own home,they survive.
The benefits of good sleep for the whole family are huge.Babies and children need good sleep for physical development,health and educational progress.The benefits far out way the negs of a few nights cc.My dc were completely different babies once they started getting better sleep waaaaay happier and content as was I.
To Toys seriously!
There are so many benefits to having siblings which a week of cc isn't worth giving up for.Childhood doesn't start and end at the newborn stage which many mothers find hard and in my case loath.Babyhood is something to get through imvho. There are so many parenting stages,I've rocked many,been crap at a few.Perhaps posters should comment on expectations on stages of motherhood you find hard.Other siblings count too,sorry but why exactly should the needs of one outweigh the needs of an entire family which includes the breadwinner trying to manage holding down a job?
Honestly some people live in cloud cuckoo land.