Agree. It's not like they don't have some pedigree. It's always difficult to know how it's going to transfer to a new country, new culture, different tactics, styles of play etc. Hell, a lot of domestic transfers that look great on paper don't work out before any of that is taken into account. With a foreign transfer you can do all your due diligence but there's always these intangibles.
Kastaneer is infuriating, I think most of us can see he has most of the attributes to be a real asset if he had the mentality & desire.