I agree with everyone. I don't think it matters since it's just a fat layer.
I personally divide right at the start of the rest. burnt ends back on, flat in the cambro. Oh,.. I don't cube it up or sauce until after its finished rendering that fat down. some people cube it up and sause it and such, then put back on,... which probably works great, just ain't my style.
---------It ain't burn't