It would be very silly to redo the PPL/Night/IMC/ATPL theory, if you already have those, given the time and extra cost to the company. It's far cheaper to get an instructor to put you through your paces and ensure your up to the standard they want before they move you onto the next phase of training.
Having those shows extra commitment and motivation, but equally someone with no flying experience may fit what they are after.
Give it a shot and wait and see....
