well Lucas will get back in and maybe gerrard but he hasn't played well enough for me
But please sell spearing not good enough for me
I think for now we need to stick to using Henderson as a defensive-minded CM and Shelvey as an attacker. Neither should be on the pitch in the absence of such a role, unless they are being used to cover for an injury to someone.
So if we're sticking with 4-4-2, in the absence of Gerrard-Lucas we must play Shelvey-Lucas, Shelvey-Henderson, or Gerrard-Henderson only. Not Gerrard-Shelvey or Lucas-Henderson, because these would create a similar problem to Mascherano-Lucas where both players are trying to play the same role, undermining the midfield.
If we're forced to play 4-5-1 (and I do mean "forced") then depending on our intent Gerrard and Lucas could be partnered with either player (if we want 2 DMs [shouldn't ever need that] then Hendo, otherwise Shelvey). Adding one of Gerrard or Lucas to Hendo+Shelvey should be fine either way, provided Henderson stays with the more defensive role than Shelvey, because Shelvey is not a defender whatsoever while Henderson looks as though he could grow into such a role. In terms of attacking intent:
Lucas (least) -> Henderson -> Shelvey -> Gerrard (most)
You'll notice I didn't mention Charlie Adam. If he is not sold (and Spearing is) then he's 5th pick behind these players, and should occupy a role somewhere between Hendo and Shelvey (if we're forced to pick Lucas-Hendo-Adam in 4-5-1 then I would not expect much from that game!). There's also the Aquilani conundrum.