Ummm....Is it possible that you meant Culps Hill, or Cemetery Hill. To the best of my recollection Ewell' s second corps wasn't anywhere near Little Round Top.
No they could have easily gotten up to Little Round Top. They were coming down from the north (Harrisburg) and would have gotten to the Round Tops right when they reached Cemetery Hill. Then the Union would have been forced to withdraw and make the fight south of Gettysburg, towards South Mountain, Waynesboro, Hagerstown or Frederick.
If Heth had been able to push Buford quicker, then the same could have happened, but they were bottled up on the road coming from Chambersburg and had some issues there too.