hmmm. while the OP referenced "shot pal" as possibly being the culprit it seems his bigger concern was that a "lower tier" player put a beating on one of the clubs "top players"... since it seems to be a consensus that shot pal does not give anyone such an edge...
maybe revisiting the OP concern that something is off whether he phrased his inquiry correctly or not... my impression is that it sounds more like he is trying to discern whether this other player is more likely a "restarter," a sand bagger, or using some other form of cheat software, but not necessarily shot pal.
12 shots is a pretty big swing, but sometimes WGT can get in the way as well. One player seems to get unexpected shot outcomes while the other throws darts. it is like one player is being bad vem'd while the other is getting good vem. it can happen both ways, I have felt the screws were tightened and I had to scratch out pars and I have felt like times, I could do no wrong everything was nearly perfect. I had thought to myself...I know I am not this good!
it doesn't happen a lot and I think there was only one time on the desktop as a lower tier player, I ended up with an edge over a top ranked player in a skins game. That said, it was no where close to a 12 shot swing.
when you see someone like that as a club owner, you can just keep an eye on them...if there are credits on the line it may be a concern but if your just playing for fun and talking bragging rights, then what are they trying to "win"? if it continues and you suspect foul play then it is your choice whether you remove them from the club.
hope it sorts out, but I also agree with all the others -- shot pal, putter pal, is not an edge...focus boost may help slow the meter so you can ding a shot, but you still have to know the yardages, landing zones, and be able to putt. being able to do all those things consistently, does usually reflect a stronger player and possibly a restarter or someone trying to game the system, but as noted elsewhere... occasionally you come across some gaming prodigies that pick things up really quick but in my experience these are quite rare because there are a lot of subtle nuances to WGT that make it rather difficult to master extremely fast. you only have to observe the large number of long term players who still work diligently to master the game.