Update: Jan 16
Will's reaction was "Wow", and then "No", and then "Maybe". Will says he wants to get married only once in his life, unlike his parents.
I do agree with the comment that Guy Wilson looks more like a son of Lucas and Sami than Chandler did.
Near the end of the episode, Will and Sonny were in bed together. Maybe Freddie (Sonny) had to get waxed to match the new Will ("thmooth", like Lucas). But that's like Ashton Kutcher's getting waxed in order to match a stunt man in "The Killers".