You can just see it.
Todd: “Yes! Now Sam, can you get me a list of players we need to sign.”
Sam: “I can, but not until November.”
Todd: “November!!!!”
Sam: “Well, yes. I’m contracted to Brighton until then.
Todd: “Hang on.”
(Sound of telephone being dialled)
Todd: “Hi Tony. It’s Todd...
I think it's more that we are honouring his contract and in 9 months the likelihood is that the data modelling will have moved on and he'll be that little bit further behind.
I've no beef with him. His heart won't be in it. He knows he's leaving a good employer to go and work for a mercenary...
Sadly, this.
If you're earning £100k* a year and someone offers you £400k a year then you're going to take it, even if you only think it will last a couple of years.
*this is purely illustrative.