Well while all that is happening, back to the thread.
Jango's blasters and missile aren't getting through the shield, meaning Jango would have to wait for Cap to present an opening. His grappling hook would allow him to potentially restrain Cap but considering Obi-Wan managed to use the leverage to bring Jango down, using it on the much more physically superior Cap might not be a great idea. But he does have his jetpack, which would allow him to fight at a distance and safe from Cap's strength(if not his shield). Jango's best bet(in a straight up fight) would indeed be to wait for an opening. He doesn't have much in the way of options.
Rogers fairs a bit better in the physical department and would probably be able to decimate Jango if he got too close. His shield provides a good defense and if he was so inclined he would probably hit Jango with it from a distance(his aim is just that good). But without it the blasters would probably hurt, potentially being fatal if it hits him in the head. Overall he does have more options since he can play defensive until Jango does something that gives him an opening or he can take the chance and throw his shield.
But the thing is Cap has 3 movies to his name, 2 where he is the main guy. Jango has 2-3 action scenes in one movie. And in those scenes, I'm sorry but he tends to fly into close range when his opponent can block his attacks. He would likely get near Cap after a while of blasting away to no avail and that will be the end of it.