where exatcly are these jobs ? the serious one are found only by "word of mouth" and networking.
anything else is usually about enslaved and low-paid "photo assistants", see Craigslist etc...
i don't know if Yuri is a famous brand in the advertising world but i bet he's not and they would not put too much weight in you having been one of his students.
besides, the reputation of microstock in the industry is quite bad, some even don't consider microstockers as real photographers and others dismiss stock at all, no matter if you're with getty RM or what, it's a very eletist and difficult market outside of stock.