Hope not, but he is definitely not safe. I always got the impression that Marcus didn't have the biggest fanbase but won over 'floaters' by being consistently good and being versatile. Tonight was a weaker performance for him so he may be at risk at losing these floaters to Amelia. However he is one of only two male out of 7 acts, so that must help him (also on a shallow level, he is the good looking one, so that also helps).