If Janet lands in the B2 I think that she'll be gone, and it is likely to happen, imo. If it doesn't all the rumours of her topping the votes every week will definively have a lot of substance.
She could be with any of the others, imo, but I think in likelyhood order:
Misha hasn't got huge support as she landed twice in B2
Little Mix were first and were OK but not outsanding
Amelia hasn't had time to accumulate a dedicated core fanbase and her second song was just OK
Marcus' style is outdated and if we didn't have reports that he is strong in the voting I would think he is in danger.