Makes sense for me, His is not the player which worth the signing at the present. The possible plot is to use this signing as intermediate step for his retirement and pay him the dissent protection money, more likely from the sponsor pocket. I only wonder who is that generous to a fault sponsor. Probably the team will also get their part and that is why they agreed to this deal.
Coming from Corinthians and its history, I know very well where this money comes from. With all this repercussion of the owner of a betting house being arrested, the events with betting houses in the past at Corinthians itself. Everything points to some criminal scheme, but I prefer not to go into depth and judge only these questionable signings.