So if they were legal. What advantages would they have?
You mean if they had gone through the proper channels to legally enter the country?
They would not take a job for 1/2 of the going pay rate.
The irony is, all these contractors who jumped on the illegal train, are almost all completely out of business.
They created their own competition. Prices dropped so hard that only the illegals could continue doing the work.
Now you have a lot of really badly built buildings with every possibly corner cut. In another 20-30 years the real issues will start coming to the forefront.