Perhaps 2 4* in such quick succession - and all the travelling - is not something most horses can cope with...(and not something most riders would expect of them)
The ground looked to be riding a bit jarring on the XC, and the arena surface was very dead to walk on. Very few horses jumped well in the SJ, but CQ was car crash watching, sadly.
Oli rode him really well (other than retiring), considering the horse's lack of energy.