Helenius is too shot to compete with the speed Wilder brings... it would be very hard for him to win Only chance I can think off is that he uses Furys tactics to shut wilders offense down but Helenius is a counter puncher not his style
Viking Rob is an injury-ravaged shot 36 y/o, in other words your typical Bootleg D opponent. That being said, he can crack very hard with that right hand of his and he's moderately skilled (he's Loma compared to the usual Bootleg D fodder) and if he detonates on that shaky mandible section D's going to sleep.
An interesting trio to make fights that could go either way between very flawed limited fighters that rely on their power in Wilder, Helenius and Price.