Oh FFS.
Does "FFS" mean what I think?
If it does I would suggest you read through this thread again and close it as clearly answers are not appreciated.
There is nothing nothing with crates if they are used properly. They are not means to punish but sometimes dogs do need time out if their behaviour is unacceptable. How do you normally show your dogs they have acted unreasonably?
In the wild Luca would not have survived. He would not have been accepted by the pack because his disability would weaken their survival rate and he would have been a burden to them. Quite possibly this is why your other two dogs don't accept him.
No dog should be allowed to become food or toy aggressive so I'm afraid you have created that issue. I don't expect two year olds to chew either.
You are pack leader. Take control.