To my knowledge, Will Koch did not want Voyage to have a loop in it. If he had, and Gravity Group would not do it, knowing Will Koch, he would have found someone who would have done it...
I trust you, just thought someone had found an article in German, and when translated into English it talked about how the Voyage at Holiday World was designed to have a loop in it, after President Will Koch rode Son of Beast and thought they could do better.
I did find a article in German and when I translated it, they talked about Voyage planning to have a corkscrew... I'll have to ask my Swiss friend to find it for me again, lol.