There is no grid leakage current - and the grid resistor has no effect on anode current in any method of biasing.
There are essentially two methods:
1) You provide a negative voltage to the grid, and ground the cathode.
2) You connect the grid to ground via a resistor (as in this circuti), and place a resistor in the cathode. The voltage dropped across the cathode resistor is the negative bias voltage for the grid. This is called auto-biasing.
This circuit runs the valve absolutely flat out at all times, not good - and I've NEVER seen it done - or using a low signal triode as an output valve.
It's really, absolutely, terribly, horrible - don't consider it for a moment