Cornish X are actually easier to dress out than DP, in my experience. I remember having watched many YouTube videos and then doing it myself it seemed.....harder. The CX are both very big and very young, so there's lots of room for your hand plus the connective tissues aren't as strongly tethered yet. An old rooster is much more challenging, especially if you're skinning.
I thought that would probably be the case... they have a much larger frame. I haven’t done any older Roosters, stewing hens, or meat birds yet. Just some 19-22 week old layer breed cockerels and two Dual Purpose cockerels. I imagine a CX or other meat hybrid would go much quicker for processing