Great points, Dimples. Plus I'm sure he doesn't want to be the one to push CA the rest of the way over the edge. He's been up front with LE from the start but he has to know how fragile his marriage is - and the fact that C may never be able to accept the truth. IMO no matter how much he wants to believe Caylee is alive he's having to come to terms with the fact that she isn't - and he's having to deal with this on his own.
C is so off the wall and makes me angry more often than not, but I honestly believe her behavior and her determination to believe KC - and believe that Caylee is alive -are nothing more than defense mechanisms. I do not think she is a strong woman even though she tends to act like she is. I do think she's trying desperately trying to hold onto her sanity and this is the only way she's able to do it. And I'm sure G knows this only too well...
KC committed the ultimate sin by murdering her daughter - a precious angel and the light of C and G's lives. And by doing so she also destroyed her parents / her family. It wouldn't surprise me if KC is seeing this as a bonus. As warped as she is and as jealous as she was over G and C's love for Caylee and her love for them, it wouldn't surprise me one bit.
Also, I've read a lot of speculation on why G went to that spot. IMHO it was the logical place to go since it's one of the main areas of focus - something that's pointed out nightly on NG and probably by the local media as well. And I honestly believe that if he knew where Caylee's remains were he would make sure LE knew so she could be returned to the family and properly buried.
I do not, however, feel he (or C for that matter) should be involved in any searches - not on their own, not with TES, and not with anyone else. It's going to be hard enough on them when she is found and identified, and I don't believe they would be able to go on if they were the ones to find her (which is another reason I'm convinced they don't know where she is).