For YEARS I thought the band had 3 different vocalists because I saw ITE for the first time on TV watching Chester with his classic "Super Saiyan" short haircut and then a few months later I remember also watching the Numb/Encore MTV music video that they did and I saw 2 guys with a cap, realizing one of them was the rapper (didn't even know his name was Mike Shinoda) and the other one, wich I thought he was new to the band.
This type of things can easily happen even if you know them for a long time, so, yeah, completely agree with RogueSoul and you, he's gonna work his ass off if he wants to truly success as a single artist, but I'm sure if he plays in places like Russia or Japan he will sold out.