Yup. The 100 ohm resistor would have minimal effect. You might see 100mV drop in the supply rail during very loud transients but the effect of that would likely be inaudible.I'm not seeing the difference. The output buffer and the values of the supporting resistors in the Grid Slammer and TS9 are the same. And I don't see how the 100 ohm resistor would have any meaningful effect on the tone. It's really just a TS9 with two additional diodes.