Everyone knows he’s leaving, I don’t know anyone who has a justifiable reason to object to his decision. You’re not looking to do a deal, you’re looking to avoid paying the going rate. He’s got 20 months to sit in his garden under the terms of his contract, he’ll get paid his notice period, which will not be anywhere near 20 months. He might get paid for 6 months and then have 14 months before he starts for you.
I don’t personally think that’s good for anyone but, the balls in your court for that one. We’ll have already started the process looking for a replacement and are likely to face a smaller scale situation based on the contract of the candidate we go for.