Reading between the lines it does appear the Doc has possibly loaned him a sum of money that was offset against his contract. Taking into account MK's comments about wanting Locke to stay in SL it seems to me (with the grudge he now has) that the Doc wants another competitor club to experience the same problems he's endured. It could be untrue but there is no smoke without fire. Something hasn't been right we have known this for months.
I think what sent the alarm bells ringing for me was when Locke said pre season he's never trained as well and then failed to make the team in our opening fixture at Warrington. (After all the games Locke missed the previous year)