I'd like to have seen that run with LR going first. You can't wind back the clock, but that 80 did a fine job of cutting through the middle of the rut with its diff. Getting stuck on the diff is very common in ruts like that. The LR has a slightly different diff casing profile too - not by much, but if it were only an inch or so higher in the middle it makes a world of difference.
I spend as many weekends as I can in mud pits like that. I love it and whilst I do spend a lot of time pulling green ovals out, I never cease to be amazed at how good a standard Disco is. I don't know what it is, weight? That A frame rear end thing? Only a CD lock and they do fantastic things. Barely any of them fitted with winches, decent tyres or a proper lift, so there is always going to be a limit to them. That's when they radio me. If you took a Disco, did a proper job on it with lockers etc, it truly would be an awesome thing. But folks seem to buy them for £800 MOT failed, bring them on a trailer, wreck them in a weekend and break them for parts. It's criminal really. I have spent enough time in one to not like them at all. But if they're your thing, spend some money on it and come and pull me out for a change. If it will start of course.