I don't think Hulk has the power to hurt Cap. That shield can take anything Hulk can throw at him. Cap is enough to at least stand to Hulk.
Gambit knocked the wind out of Gladiator, which ani't much when dealing with these guys but to even move him is a feat.
Daredevil might best stand really close to cap and advise him of incomming.
None of them could even phase Hulk. Gambit wouldn't even bother to show up, Daredevil would "play it safe" and remind Hulk he was blind so he could take pity upon him. Captain America would be the only fool to try to stop Hulk and when all is said and done hulk has a new shield for his fireplace mantle!
Hulk can easily use a shockwave attack on cap. His sheild can't protect him from that. Even if hulk punches the sheild the sheer power from the blow could slam cap through a wall, mountain or anything, cap's back isn't protected. You are correct in saying hulk can't hurt cap directly by attacking his sheild though.