I so don't understand appy.
I know Tana's sire was a leopard appy (untested, so no idea of genetics behind it), she just has characteristics, no spots, and I don't think she's varnish, but with her coloring it might be hard to tell. [Tana is silver bay dun, looks a bit like a dark palomino.]
Tana's son, Monte also has characteristics but no spots, and I don't see varnish yet. [Monte is grulla.]
Tana's son, Spotty has a blanket and white tipped ears. [Spotty is bay.]
Both colts were sired by a bay stallion with no known appy genes.
I'm contemplating color/pattern testing Spotty with the color package at UC Davis (at least I think it's Davis), that tests red factor (black), Agouti, splash, LP and PATN1, last I heard it was like $60.