Generally I think it is a mistake to take loan players, any short term benefits are outweighed by longer term disruption, UNLESS there is a specific gap in resources due to an injury. If Fish is injured this signing is fine.
I could not go on Saturday but the radio commentary suggested that Weston nailed Fish twice in the first few minutes. If true this sums up Weston. It took him three seasons to make a tough tackle and then he chooses a Gills player.