In approximate order or ability below. I should point out that the set of midfielders below are stronger than the majority in our curry under 17/16's age group (Evans aside).
Evans: A terrific talent. Delighted he has signed a long term contract as some top clubs were monitoring him. He is quick, good on the ball, confident at dribbling, has vision and an eye for a goal. Also over 6 ft tall. Looks a real prospect. Often has the under 18's and under 21's built around getting the best out of him.
Ledson: A lot has been written about him. Tall box to box Midfielder. Strong in the tackle, good passer with a decent shot on him. Like a Defensive Gerrard type player or a young Rodwell. Not been included much recently so needs to get more game time you would think.
Dowell: Already featured for the first team. A natural number 10. Drifts into great positions, has brilliant vision and can naturally play one touch football way beyond his years. Also he has grown a lot in height over recent years. He does look a bit languid though and isn't a great mover. I think he is quite similar to Ozil in style and ghosts past players. He will be fine as long as Martinez stays but I would be worried is another Moyes type manager came in. He will be viewed as a "luxury player"/
Walsh: Arguably the most talented young player we've got. he has fantastic technique and an ability to control the flow of a game from a deep lying position. The worry is his size. Again like with Dowell I would worry if Martinez went. In an era where young players tend to be 6 ft+ and good athletes he doesn't fit that. Ledson and Evans will stand a chance whoever is in charge, but Walsh will need a little more care.
They are the main 4 contenders. Some others to keep an eye out:
Donuhue: This lad is a bit of a mystery to me. Often for the under 18's looks head and shoulders above the rest. A great dribbler, gutsy and can finish. However he hasn't had enough time in the reserves for me to think he is knocking the door down for selection.
Williams: He has ticked all the right boxes. Tall and similar to Ledson. I don't see him having that standout ability to make it at Everton though, but we will see.
Davies: Currently a 17 year old. Strong lad, see what I've written about him in his own thread.
Bannigame: A young lad to keep an eye on, looks big and strong.