Mason would be a cracking signing for a mid-playoff side who realistic aren't going to get any higher on a regular basis and can afford to take a risk, (hence KR and Hudds) as if Mason comes off, and performs to how he can, they'll be up there in the league as I think he is that good.
However, the teams who are going to around the top regardless (i.e. the current top 4) its a needless risk. He could come and destroy team spirit, morale, everything.
Certainly be an interesting signing, and wouldn't fancy picking a fight with Hudds with the pack they might have next year!