Howson is absoloute quality. I would love to have him in our side. Leaving West Ham aside, I'd say Howson is the best CM in the league alongside Andy King.
But to say he will completely tear our defence apart, clearly means that some Leeds fans have no idea how good Fonte is. There will be very few CBs in the division who'll out-perform him. Granted the rest of our defence is slightly weak at this level (especially Harding), but rule out Fonte at your peril.
Moreover, our CM will most likely be Hammond and Cork - both of whom are solid defensively. It's not like our whole front 6 will constantly be in and around Leeds' penalty box all game, and Howson will have as much room as he likes at the other end.
Many Leeds fans appear to be understanding us, and many of us appear to be underestimating Leeds. I rate Gradel and Snodgrass hugely, but I'd honestly still take Lallana and Chamberlain ove them (although in an ideal world, I'd move Lallana centrally, and then bring one of Gradel or Snodgrass - probably Gradel - into the side). And Lambert is better than Paynter.
Chamberlain's fitness is the absoloute key. Because if he's not fit, suddenly Leeds' attack does look better than ours (albeit we just don't know how good De Ridder) and they subsequently might just nick it 2-1. Fingers crossed he's fit though, cos I'm sure the game will be a draw if he is.