Palhares has not fought any to level fighter in his career and he has a submission armbar victory over Ivan Salaverry at UFC 84 - Ill Will, but Salaverry is no where in the same league as Henderson. http://www.fighting-mma.com/mma-matchups/2008/ufc-88-gambling-dan-henderson-rousimar-palhares.php Bet it all on Henderson for a great payout
Danny has fought a lot of good submission fighters (Newton, Arona, Bustamante, Sobral, Ninja Rua, etc.) and fared well. The only guys that have given him trouble are the elite of the elite (except for Misaki). I don't think Toquinho has enough wrestling to take Dan down or good enough striking to hurt him and force him to the ground.