What is the current flow logic of this NPN configuration
The base current is approximately:
Ib = (Vcc - 0.7) / (Rb + Beta * RL)
In order to reach maximum collector current the Rb should be zero. This circuit is safety working with zero ohm Rb. But even with Rb=0 ohm you never reache saturated state of trasistor, there always will be some Vce drop (at least 0.7v).