I thought I read further back that Ghaleem says both his sire & dam are grey - surely that means he has to go grey eventually??
The base colour, chestnut, will grey out over time as greying is dominant anyway?
Not necessarily. I had 4 Arabs (one a chestnut) all with grey sires, and not one of them turned grey! In fact, the only grey I ever had had a homozygous grey sire, which is the only way you will *definitiely* get a grey offspring.
I have a bay filly and both parents, all grandparents and 7 great grandparents are grey, the great grand dam is the famous Hanan who was bay. Grey is always dominant (or should I say the greying gene) and if the horse has the greying gene it will be grey. However it can carry a non greying gene and pass that on. If both parents are grey and both have a non greying gene which they pass on then the foal will not be grey. If neither of the parents are grey then the foal won't be grey. Unless you know the colour genetics of your harse the only certainty about clour when you mate your horse is that if both parents are chestnut then the foal will be chestnut. Once a grey parent has had a non grey foal then you know that horse has one non greying gene so can pass on grey or colour. If a grey has one non grey parent then it will have a non greying gene so can have grey or coloured foals (not as in "coloured cobs, solid colour).
My mare is so similar in looks to yours even down to the top of tail colouring she has it round her ears as well. Can't tell what sire was nor dam she has french, polish and a bit of Russian in her lines.