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@TheBrick(Tommy)
If you rota fix on your cog really really really tight then especially with a b.b lock ring and thread lock you should be fine (but run a brake just incase)
By using the rotafix method you are getting the same amount to leverage as will be applied by skidding and hopefully unless you are really weak more force and hence more torque. OS in theory every thing should be swell. However skidding force are not applied evenly by their very nature, there can be a sudden snap, causing a greater amount of inertia to be placed on the cog. However most peoples legs give way a little during the first instance of the skid thus reducing this inertia. Another factor may the fact that most cogs are hardened steel and more hubs are alloy so maybe the shock can cause damage to the non hardened alloy threads. I am less sure about this, not really too familiar with metalology and stuff.
Draw your own conclusions.