Quartey's biggest problem was his lack of punch output (see Forrest fight). But his jab would probably end up bouncing off of Starling's gloves.
Starling by decision. Ike liked to walk forward behind the jab. Starling would block the jab and counter all night long.
I don't know. Like might be able to keep him off with that jab and strong enough on the inside to match Starling. Starling has the speed but Ike was a little underrated on Defense.