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Your mare has splash making her tail white, not GP.

The sire of the one you bought is hom GP, therefor, all the foals must have at least one GP.

Gulatra Plume has two requirements that must be met for it to really be visible: the horse has to be bay based and homozygous for GP. It does cause some lightening of the mane and tail of buckskins when heterozygous. For non-buckskins, the only way to identify a GP carrier is by pedigree (does the horse have a GP parent) or progeny (has the horse ever produced a visibly GP foal).

APP That Weird Kid has to carry GP because his sire is homozygous for it. Also he has the subtle lightening of the mane and tail that buckskins with heterozygous GP exhibit.

2G Angelic Interest, is not GP. The white in her tail is caused by splash.

If he were homozygous GP, his tail would be white at the bottom. His mane and tail are lighter than you would expect for a bay or buckskin--dark gray and not black. This indicates that he is heterozygous GP. Evidently he did not get the dominant GP gene from his dam.

A buckskin classifies as "bay based" which just means that they are E? A? regardless of any possible dilution genes.

I don't know if you'd want any more information but that's an old horse of me that I sold a long time ago. My goal was to breed a homozygous GP horse, but he didn't end up homozygous and that's why I sold him in the first place. His dad is homo GP, he has the typical white tail which you can see. I was hoping for his mom to pass on her GP gene (which she has only one from; heterozygous GP) but she didn't since he didn't end up homozygous GP (he doesn't have that white tail). Since his dad is homozygous GP he always passes on his GP so your boy is a hetero GP. Since he is a buckskin you can see it in his mane and tail that he is hetero GP; they are lighter than a normal buckskin.

If you want more GP examples feel free to browse trough my barn searching on GP: http://www.huntandjump.com/adv_search.php?status=any&ageg=&agel=&agee=&erag=&eral=&erae=&f_basic=none&f_adv=none&tattoo=&f_limit=25&stallion=1&mare=1&gelding=1&spayedmare=1&name=gp&name_lm=like&color=&color_lm=like&bty=1&lined=lined&foundation=1&sire=&dam=&barn=&owner=160524&breeder=&e1=&e2=&a1=&a4=&a2=&a3=&f1=&f2=&p1=&p2=&s1=&s2=&s3=&c1=&c2=&c3=&d1=&d2=&g1=&g2=&ch1=&ch2=&z1=&z2=&sa2=&sa1=&kit1=&kit2=&kit3=&kit4=&kit5=&kit6=&kit7=&kit8=&kit9=&kit10=&sp1=&sp2=&sp3=&pax31=&pax32=&rb1=&rb2=&o1=&o2=&l1=&l2=&ice1=&icei=&ice2=&ice3=&ice4=&ice5=&ice6=&ice7=&ice8=&brindle1=1&brindle2=1&wf1=1&wf2=1&wf3=1&wf4=1&wf5=1&wf6=1
I have homozygous and heterozygous GP horses. On the buckskins you can see that they are heterozygous GP (compare those with 'normal' buckskins and you'll see the difference!) but on other horse colors it isn't visible if they are hetero GP or not.
Another thing that makes it hard to see if a horse is GP is Silver and Champagne. If a horse has champagne it is less visible if it is heterozygous GP. Homozygous GP on champagne is visible however.
Silver hides GP completely, since it affects the mane and tail of that horse (it makes it silver) so GP won't show.

He could sire a homozygous GP foal from any mare with at least one copy of GP, but a homozygous GP mare would mean the foal will for sure be at least heterozygous GP.