We've worked with them for a long time and they've hired tons of artists during that time. Outsourcing is more the norm these days so I don't think you have to take that into consideration when applying somewhere.
Man...I've had my eye on Riot for quite awhile, really like their game...it's almost a game about character design, very cool. I had no idea they out source the work like that and not do everything in house though...actually I didn't even know companies like Valkyrie existed... I took a break from working a few years ago…