How long is Kashket's contract. If it's for two years and we get relegated then I would keep him. Otherwise not.
Ainley's contract goes beyond this summer so unless he wants away, he'll be here next season. I don't know about Lundstram's contract but he's still developing and he should stay.
The only player we would miss is Lowery and a striker/target man as I can't see Mandron staying and surely Porter cannot keep going.