Spark is initiated by voltage. That defines how "long" the spark is going to be. The current starts in ionized air BEFORE real metal connection. In out voltages it is practically 0 but still enough "over" zero to make a spark.
Spark is not our problem, our problem is erosion. Erosion depends on current. That is what can melt metal, and transfer particles. That will damage connector if you do not prevent it. So the question if to use it or not is more question how often you want replace connectors.
So that means - if you have battery with more cells (like 6) and with thick wires able to give enough current, and you are going to connect it to capacitor which is specially designed to accept high current with low serial resistance (that is why there is that low ESR capacitor), you are connecting 26V to charge that capacitor from 0V. It will make spark transferring some certain electric charge to capacitor in very short time and it will melt metal on the spot where spark started.
If you put resistor in series and you do the same, spark will appear, but the same charge will be transferred in longer time by small and safe current which will not damage connector, because heat transfer will be able to stop heating on low and safe temperature. I did not read your link, but I saw there is explained that time depending on capacity and resistance.
So the point of resistor is to charge capacitor slowly (low current will not transfer particles) and only then to make flight connection with low resistance. You will connect it when voltage of capacitor is the same or similar to battery voltage, so it will not make that spark.
You can do it either:
1/ you can connect resistor (button, another small connector etc.) in series with battery and then to short it by flight connector
2/ you can connect battery temporarily with resistor in series (specially designed connectors connecting first resistor and then flight connection, or simply external resistor in series etc.), that will charge capacitor and then immediately disconnect it and connect flight connector without resistor ... capacitor will not discharge during that short time - and that is your case, make another plug having resistor instead that blue wire - then put it in, let capacitor to charge (you not need to insert it fully, enough to touch) and then quickly replace with normal flight plug
However this can fail on some ESCs. For example if ESC immediately "beeps" with motor, it can load resistor so much that it can for example burn, or ESC can try to measure connected battery and loaded resistor will show wrong battery parameters etc. That is reason why some makers did not recommend antispark resistors in past. I think actually it should be solved since 10 cell batteries are common in R/C and there is antispark absolutely necessary, some ESCs have them even integrated. But ESCs with switch do not make those problems like larger Jeti Spins etc.