Kurolegacy :
or maybe he wasn't completely cured(heroes sometimes made a mistakes). We don't know anything except that he is in Hulk form and he had green eyes before he died.Which in itself is up to Duggan to explain. There's the possibility that could be as a result of the Hand resurrecting him as in the past we've seen Mystique's powers grow stronger after being revived by the Hand.
There is a possibility that in AU (without Ulysses, with cured Banner) Cap would use gamma radiation to create new Hulk to create Civil War.