Perhaps this is why he is charged with Murder 2? ...it would certainly help a jury convict if there was a suggestion that TM felt the need to arm himself prior to arrival in WS (even if the intention was not to kill)
as tom and Sharon changed plans unexpectedly and drove to nc, when and where did tom get the time to stop off to buy a new bat for jack? They appear to have made an unplanned visit and were there the week before. When did he buy the alleged new bat? I suppose he could have bought it in the intervening week but it's a bit of a stretch all the same.