Here we are, once again, on the final leg of our journey. Dark brothers and sisters, at least we reach the final (non-heroic) challenge of raiding content; Cho'gall! Alas, he isn't all that he is cracked up to be. If you have managed to clear the rest of the Bastion of Twilight -- which you rather have to in order to get this far -- then you shouldn't have many issues with this encounter.
As with everything in raiding, certain battles are more difficult in one raid size than they are in others. For Cho'gall, going along with 24 other makes the encounter far easier than doing it with only 9 other people. It's just another one of those things that you have to take it for what it is. I wish you luck in this encounter. Oloth plynn dos!