So there was a contract, even if you joined the team later then you have taken on your part in the team contract.the only agreement to the sponsorship for the team was written on the team forum and pinned. Well just before litigaton was mention by said owner, he amended the terms of the sponsorship. So instead of said sponsorship for the period 2012, it now read sponsorship beginning 2012 running into 2013. The date stamp of the amendment shows this. Said owner is trying to cover his own tracks
The contract was amended at a later date, Perfectly fine if a contract details a period and it is extended.
Fid you rename the team before of after the amendment?
If after then the above implies you and him have access to the team forum, this implies a connection still,
If you have left then you should no longer have access to his team forum
If it is the teams as an entity that has become sponsored by him then he shoud no longer be in the forum once you parted
Asmentioned long ago this should be dealt with between you, him and the team. Not publicly