Bullrush, with both injury free I very much doubt Ben will outplay them in Super Rugby. There's a reason why the bloke hasn't done so yet (barring injuries to Palu and Higginbotham), they are simply more talented footballers.
Ben's a hard worker whose graft has been handy, but you can't go giving out top ups to blokes who are likely 3rd in line for a position, the money isn't there.
The ARU should not regret letting him go, they may end up needing him perhaps, but with limited money to contract players, so a limited available, he doesn't quite warrant it.
Prioritising Mowen would be aiming for mediocrity (That's a little harsh, but the best word I could think of). I'd rather we prioritise the best so we can strive to be the best barring injury, than make safe contractual decisions which will never get us to Number 1.