Cap can only stalemate. Creeper can't really die until his feeding time is up and he hibernates. Cap would have to make sure Creeper doesn't eat anyone to regenerate body parts.
Up close is where he'd start dissecting him. He's much faster and strong enough that he won't be completely overwhelmed. But it's doubtful Creeper lands Amy good hits.
Without shield i think he is still stronger but creeper has the advantage of flying and a very good healing factor so Cap will give him a good fight but eventually loses.
Meh. Even with the shield Creeper could take a few. He usually sizes up his prey and waits to make an advantageous move. The creepy sucker uses tactics. I could see if it was stalking Cap, it could get the drop on him. It keeps its distance and chucks a few bone stars injuring him. Then comes in and cleans up an injured, and slower, cap. But yeah, straight h2h Caps probably got him.
__________________ Listen, boy. Have you ever had your scrotum pulled off by a mountain goat and seen him sell it on eBay a day later?
Cap has highly enhanced perception/senses. I doubt even Creeper could successfully sneak up on him. And he'd hear the shuriken whistling through the air. But I don't think scenario 1 is a hunting sort of thing. They're just fighting. In the 2nd one they're already in the bus.
Well he's got the one in the first Cap movie where he pinpoints a treetop sniper that you couldn't even see. And he's got one where he notices several things out of the ordinary in the elevator. Like a guy sweating because he's nervous, unholstering his gun, etc...