Jon is currently extremely busy with his new store and etc so it might take a while for him to reply to your PM or email. Why don't you give him a quick call if you are in US?
But from what I understood, both Gesshin Uraku and Yoshihiro are from the same maker. However, as No Chop said Gesshin series meet JKI standard, which means you won't see the usual issues (i.e. low and high spots) you would see in other entry level J-knives. It's like they put more efforts to make their knives for Gesshin Uraku than their usual Yoshihiro kasumi series.
Having said that you could still end up with a good one even if you buy directly from Yoshihiro depending on your luck.
If you buy Jon's Gesshin series, it means you are buying a knife that passed Jon's F&F quality standard. I have read many posts here in KKF about Uraku and it seems everyone who bought them is very happy. I'd have bought them too, if the shipping to AU was cheaper.
That pretty much sums it up IMO.