Not being rude here.. I bought a 41 D28 Authentic.. hyde glue could not be seen at the Joints... .. It played and sounded outstanding..
Now that being said.. owned for about 4 months in a properly tempitured ,Humidfied room in its case.. took out of the case to see all the sides were seperating from the back and top.. I think I would rather have some comfort in knowing the Glue is shown that holds the Guitar together than Not shown at all to know they might not of had enough period..
I own quite a few 20, 30s 40s, 50s Gibsons and martins.. The glue sure hasnt been a issue on those.. and there values on those has not fallin because of excess material....
Enjoy your Koa..
when you get that first chip.. that will not hurt its sound or playability..