Agree. As shown by that physics professor with his noble peace prize winning theory " Why Talls Blokes Fall Over Easier."I think physics comes into play a bit here.
Being so tall means he has a higher center of gravity, much easier to tip over.
Grundy is fortunate in this regard as he has the long torso and big backside and legs which lowers his center of gravity and makes him much more stable. A taller version of the Peter Daicos physique.