I would guess that your grower might have repeated that cross. He probably did not have had the original cultivar handy to do the cross, hence perhaps the question regarding spots.
Regarding the guttata versus leopoldii, I usually look first at Kew/ Checklist of Selected Plant families,
I typed in Cattleya guttata
https://wcsp.science.kew.org/p...
a whole list of possibilities/var., sub var. , f pops up
and one of the choices was this
https://wcsp.science.kew.org/n...
looks like a synonym
Hope that helps
