The cast in ferrules is a total failure Mira, it's ok to be...

The cast in ferrules is a total failure Mira, it's ok to be repeatedly tested on a slab in the FBR compound for YouTube videos. But on a real building site whilst setting out and forming up and pouring of a concrete slab, with temperature changes the exact position of them are totally unknown, hence why they had to lay the first layer of blocks to get a known position, as per FBR video footage at the time. Anyway an engineer will mostly require, especially in US, any reo to be connected and formed/cast into the slab, especially for lateral wall support for hurricane building codes.