This is a real brain teaser! Sort of like which comes first, the chicken or the egg.....except that I think there may actually be an answer....You can't have much insight until you have hindsight with experience. You need to have insight to have foresight and you can't have oversight without experience which usually results in hindsight which creates insight...! Ok, now I'm totally confused.....!
But to answer your original question of which is most important, I guess it would be hindsight, because though it may sound a bit negative, it really is the closest I can see in the list to learning and learning is the most important of all of the things listed in your string....without learning, nothing can go forward, and there can be no insight or further learning (hindsight) or foresight that amounts to anything because foresight requires hindsight!
....although oversight is pretty important too - because without oversight one cannot learn either....one has to be observant of his/her surroundings in order to learn....
Ok, please teacher, tell us the answer now!